Vulnerability-Lookup

CVE-2021-34473 (GCVE-0-2021-34473)

Vulnerability from cvelistv5 – Published: 2021-07-14 17:54 – Updated: 2026-08-10 15:11

CISA Shadowserver Previdian

Title

Microsoft Exchange Server Remote Code Execution Vulnerability

Summary

Microsoft Exchange Server Remote Code Execution Vulnerability

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-04 15:42 UTC

CWE

Remote Code Execution
CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

microsoft mitre root

References

5 references

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch
https://portal.msrc.microsoft.com/en-US/security-…	x_refsource_MISCx_transferred
https://www.zerodayinitiative.com/advisories/ZDI-…	x_refsource_MISCx_transferred
http://packetstormsecurity.com/files/163895/Micro…	x_refsource_MISCx_transferred
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

5 products

Vendor	Product	Version	CPE status
Microsoft	Microsoft Exchange Server 2013 Cumulative Update 23	Affected: 15.00.0 , < 15.00.1497.015 (custom)	guessed
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 19	Affected: 15.01.0 , < 15.01.2176.012 (custom)	guessed
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 20	Affected: 15.01.0 , < 15.01.2242.008 (custom)	guessed
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 8	Affected: 15.02.0 , < 15.02.0792.013 (custom)	guessed
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 9	Affected: 15.02.0 , < 15.02.0858.010 (custom)	guessed

Date Public

2021-07-13 14:00

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: d553dd46-4f41-4096-beac-adfa3e2b2546

Vulnerability ID: CVE-2021-34473

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps

First Seen: 2021-11-03

Asserted: 2021-11-03

Scope

Notes: KEV entry: Microsoft Exchange Server Remote Code Execution Vulnerability | Affected: Microsoft / Exchange Server | Description: Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-34473

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details

Cwes	CWE-918
Feed	CISA Known Exploited Vulnerabilities Catalog
Product	Exchange Server
Due Date	2021-11-17
Date Added	2021-11-03
Vendorproject	Microsoft
Vulnerabilityname	Microsoft Exchange Server Remote Code Execution Vulnerability
Knownransomwarecampaignuse	Known

References

CVE-2021-34473

Created: 2026-02-02 13:26 UTC | Updated: 2026-02-06 07:53 UTC

Shadowserver

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: d86d5c14-e8e4-4e7a-9d23-3ed1893d7ce5

Vulnerability ID: CVE-2021-34473

Status: Confirmed

Status Updated: 2026-09-07 00:00 UTC

Exploited: Yes

Characteristics

Severity: 98.0

Timestamps

First Seen: 2023-10-14

Asserted: 2023-10-14

Last Seen: 2026-09-07

Scope

Asset Exposure: ['internet-facing']

Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details

1D	1
Iot	no
Feed	Shadowserver Foundation honeypot/exploited-vulnerabilities
Type	http-scan
Class	email
7D Avg	1
Vendor	Microsoft
30D Avg	1
90D Avg	3
Product	Exchange
Cisa Kev	yes
Connections	96
Observation Date	2026-09-07
Vulnerability Class	CVSS
Vulnerability Score	9.8
Vulnerability Severity	Critical

References

Created: 2026-07-01 05:53 UTC | Updated: 2026-09-09 01:00 UTC

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: ae903245-b003-426c-aa0a-1c198f3afa72

Vulnerability ID: CVE-2021-34473

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps

First Seen: 2021-11-03

Asserted: 2021-11-03

Scope

Notes: KEVIntel entry: Microsoft Exchange Server Remote Code Execution Vulnerability | Affected: Microsoft / Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 9, Microsoft Exchange Server 2016 Cumulative Update 20, Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Exchange Server 2019 Cumulative Update 8 | CVSS: 9.1 (CRITICAL) | EPSS: 0.99999 | Used in malware: yes | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details

Feed	KEVIntel (kevintel.com)
Title	Microsoft Exchange Server Remote Code Execution Vulnerability
Vendor	Microsoft
Product	Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 9, Microsoft Exchange Server 2016 Cumulative Update 20, Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Exchange Server 2019 Cumulative Update 8
Added Date	2021-11-03T00:00:00.000Z
Cvss Score	9.1
Epss Score	0.99999
Cvss Severity	CRITICAL
Epss Percentile	0.99998
Used In Malware	yes
Ahead Of Cisa Kev	None
Not Yet In Cisa Kev	False

References

Created: 2026-06-23 11:13 UTC | Updated: 2026-06-23 11:13 UTC

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            "description": [
              {
                "lang": "en",
                "value": "CWE-918"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-03-27T13:56:01+00:00",
      "cve": "CVE-2021-34473",
      "id": "CVE-2021-34473",
      "initial_release_date": "2021-07-13T07:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Microsoft Exchange Server Remote Code Execution Vulnerability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-34473.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-04T00:12:50.367Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_refsource_MISC",
                  "x_transferred"
                ],
                "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473"
              },
              {
                "tags": [
                  "x_refsource_MISC",
                  "x_transferred"
                ],
                "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-821/"
              },
              {
                "tags": [
                  "x_refsource_MISC",
                  "x_transferred"
                ],
                "url": "http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-34473",
                    "options": [
                      {
                        "Exploitation": "active"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-02-04T15:42:23.926450Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              },
              {
                "other": {
                  "content": {
                    "dateAdded": "2021-11-03",
                    "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34473"
                  },
                  "type": "kev"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-918",
                    "description": "CWE-918 Server-Side Request Forgery (SSRF)",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-02-04T15:42:36.277Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "government-resource"
                ],
                "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34473"
              }
            ],
            "timeline": [
              {
                "lang": "en",
                "time": "2021-11-03T00:00:00.000Z",
                "value": "CVE-2021-34473 added to CISA KEV"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Microsoft Exchange Server 2013 Cumulative Update 23",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "15.00.1497.015",
                  "status": "affected",
                  "version": "15.00.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Microsoft Exchange Server 2016 Cumulative Update 19",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "15.01.2176.012",
                  "status": "affected",
                  "version": "15.01.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Microsoft Exchange Server 2016 Cumulative Update 20",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "15.01.2242.008",
                  "status": "affected",
                  "version": "15.01.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Microsoft Exchange Server 2019 Cumulative Update 8",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "15.02.0792.013",
                  "status": "affected",
                  "version": "15.02.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Microsoft Exchange Server 2019 Cumulative Update 9",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "15.02.0858.010",
                  "status": "affected",
                  "version": "15.02.0",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:microsoft:exchange_server:*:cumulative_update_23:*:*:*:*:*:*",
                      "versionEndExcluding": "15.00.1497.015",
                      "versionStartIncluding": "15.00.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:exchange_server:*:cumulative_update_9:*:*:*:*:*:*",
                      "versionEndExcluding": "15.02.0858.010",
                      "versionStartIncluding": "15.02.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:exchange_server:*:cumulative_update_20:*:*:*:*:*:*",
                      "versionEndExcluding": "15.01.2242.008",
                      "versionStartIncluding": "15.01.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:exchange_server:*:cumulative_update_19:*:*:*:*:*:*",
                      "versionEndExcluding": "15.01.2176.012",
                      "versionStartIncluding": "15.01.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:exchange_server:*:cumulative_update_8:*:*:*:*:*:*",
                      "versionEndExcluding": "15.02.0792.013",
                      "versionStartIncluding": "15.02.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "datePublic": "2021-07-13T14:00:00.000Z",
          "descriptions": [
            {
              "lang": "en-US",
              "value": "Microsoft Exchange Server Remote Code Execution Vulnerability"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.1,
                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en-US",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "description": "Remote Code Execution",
                  "lang": "en-US",
                  "type": "Impact"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-10T15:11:21.909Z",
            "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
            "shortName": "microsoft"
          },
          "references": [
            {
              "name": "Microsoft Exchange Server Remote Code Execution Vulnerability",
              "tags": [
                "vendor-advisory",
                "patch"
              ],
              "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473"
            }
          ],
          "title": "Microsoft Exchange Server Remote Code Execution Vulnerability"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "assignerShortName": "microsoft",
        "cveId": "CVE-2021-34473",
        "datePublished": "2021-07-14T17:54:03.000Z",
        "dateReserved": "2021-06-09T00:00:00.000Z",
        "dateUpdated": "2026-08-10T15:11:21.909Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

BDU:2021-04125 (CVE-2021-34473)

Vulnerability from fstec – Published: 2021-08-18 – Updated: 2024-09-24 – View on bdu.fstec.ru Exploit publicly available Yes Fixed

CISA Shadowserver Previdian

Title

Уязвимость почтового сервера Microsoft Exchange Server, связанная с ошибками управления генерацией кода, позволяющая нарушителю выполнить произвольный код

Summary

Уязвимость почтового сервера Microsoft Exchange Server связана с ошибками управления генерацией кода. Эксплуатация уязвимости может позволить нарушителю, действующему удаленно, выполнить произвольный код

Severity

9.4 (High) CVSS 2.0


                      
                        AV:N/AC:L/Au:N/C:C/I:C/A:N

9.1 (Critical) CVSS 3.0


                      
                        CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Class

Code vulnerability

Status

Confirmed by the vendor

Exploitation

Injection

Incidents

Yes

Remediation

Software update

CWE

CWE-94 - Неверное управление генерацией кода (Внедрение кода)

Aliases

CVE-2021-34473

References

4 references

URL
https://www.cybersecurity-help.cz/vdb/SB2021071319
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473
http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remot…
https://www.cisa.gov/sites/default/files/csv/known_exploited_vulnerabilities.csv

Impacted products

1 product from 1 vendor

Vendors

Microsoft Corp

Products

Microsoft Exchange Server

Versions

2016 Cumulative Update 19 (Microsoft Exchange Server), 2013 Cumulative Update 23 (Microsoft Exchange Server), 2019 Cumulative Update 8 (Microsoft Exchange Server), 2019 Cumulative Update 9 (Microsoft Exchange Server), 2016 Cumulative Update 20 (Microsoft Exchange Server)

Product types

Application software

Mitigations

Использование рекомендаций: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473

JSON

To clipboard

{
  "CVSS 2.0": "AV:N/AC:L/Au:N/C:C/I:C/A:N",
  "CVSS 3.0": "AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "CVSS 4.0": null,
  "remediation_\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": null,
  "remediation_\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435": null,
  "\u0412\u0435\u043d\u0434\u043e\u0440 \u041f\u041e": "Microsoft Corp",
  "\u0412\u0435\u0440\u0441\u0438\u044f \u041f\u041e": "2016 Cumulative Update 19 (Microsoft Exchange Server), 2013 Cumulative Update 23 (Microsoft Exchange Server), 2019 Cumulative Update 8 (Microsoft Exchange Server), 2019 Cumulative Update 9 (Microsoft Exchange Server), 2016 Cumulative Update 20 (Microsoft Exchange Server)",
  "\u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u043c\u0435\u0440\u044b \u043f\u043e \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044e": "\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0439:\nhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473",
  "\u0414\u0430\u0442\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f": "13.07.2021",
  "\u0414\u0430\u0442\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f": "24.09.2024",
  "\u0414\u0430\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438": "18.08.2021",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": "BDU:2021-04125",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "CVE-2021-34473",
  "\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430",
  "\u041a\u043b\u0430\u0441\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043e\u0434\u0430",
  "\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 \u041f\u041e": "Microsoft Exchange Server",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u041e\u0421 \u0438 \u0442\u0438\u043f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b": null,
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 Microsoft Exchange Server, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0435\u0439 \u043a\u043e\u0434\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434",
  "\u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0439\u0442\u0430": "\u0421\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "\u041d\u0435\u0432\u0435\u0440\u043d\u043e\u0435 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0435\u0439 \u043a\u043e\u0434\u0430 (\u0412\u043d\u0435\u0434\u0440\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430) (CWE-94)",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 Microsoft Exchange Server \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0435\u0439 \u043a\u043e\u0434\u0430. \u042d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e, \u0434\u0435\u0439\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u043c\u0443 \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u043e, \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434",
  "\u041f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": null,
  "\u041f\u0440\u043e\u0447\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f": null,
  "\u0421\u0432\u044f\u0437\u044c \u0441 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430\u043c\u0438 \u0418\u0411": "\u0414\u0430",
  "\u0421\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f": "\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438": "\u0418\u043d\u044a\u0435\u043a\u0446\u0438\u044f",
  "\u0421\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0438": "https://www.cybersecurity-help.cz/vdb/SB2021071319\nhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473\nhttp://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html\nhttps://www.cisa.gov/sites/default/files/csv/known_exploited_vulnerabilities.csv",
  "\u0421\u0442\u0430\u0442\u0443\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0435\u043c",
  "\u0422\u0438\u043f \u041f\u041e": "\u041f\u0440\u0438\u043a\u043b\u0430\u0434\u043d\u043e\u0435 \u041f\u041e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c",
  "\u0422\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "CWE-94",
  "\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0412\u044b\u0441\u043e\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 2.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 9,4)\n\u041a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 3.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 9,1)"
}

CERTFR-2021-ALE-017

Vulnerability from certfr_alerte - Published: 2021-08-27 - Updated: 2022-05-04

Dans son bulletin d'actualité CERTFR-2021-ACT-035 du 12 août 2021 [1], le CERT-FR revenait sur la publication d'une technique permettant de prendre le contrôle d'un serveur Microsoft Exchange. La technique, dénommée "ProxyShell" s'appuie sur l'existence de plusieurs vulnérabilités corrigées en avril et en mai 2021 [4] (mais annoncées en juillet) [2] [3].

Récemment, le CERT-FR a pris connaissance d'activités malveillantes qui pourraient-être basées sur une exploitation de ces vulnérabilités et ciblant les serveurs Microsoft Exchange d'entités françaises.

Le CERT-FR a signalé l'existence de serveurs vulnérables exposés sur Internet à leurs propriétaires, mais sans possibilité d'exhaustivité. Par conséquent le CERT-FR rappelle les recommandations suivantes :

appliquer immédiatement les correctifs de sécurité fournis par l’éditeur sur l’ensemble des serveurs Exchange vulnérables exposés sur Internet puis en interne ;
procéder à l’analyse des serveurs Exchange afin d’identifier une possible activité anormale à l'aide des informations fournies dans notre bulletin CERTFR-2021-ACT-035 et la présence de webshells ;
en cas de compromission, contrôler le système d’information pour détecter d’éventuelles latéralisations ainsi qu’une compromission des serveurs Active Directory.

Enfin, le CERT-FR rappelle que les serveurs Microsoft Exchange ne devraient pas être exposés sans protection sur Internet. Il est fortement recommandé d’appliquer les bonnes pratiques publiées par l’ANSSI pour ce type service [5].

Solution

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

	Vendor	Product	Description

References

Title

Publication Time

CERTFR-2021-AVI-522

Vulnerability from certfr_avis - Published: 2021-07-15 - Updated: 2021-07-15

De multiples vulnérabilités ont été corrigées dans les produits Microsoft. Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données, une usurpation d'identité, une exécution de code à distance, un contournement de la fonctionnalité de sécurité et une élévation de privilèges.

Solution

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

None

Impacted products

Vendor	Product	Description
Microsoft	N/A	Microsoft Exchange Server 2013 Cumulative Update 23
Microsoft	N/A	Microsoft Dynamics 365 Business Central 2021 Release Wave 1 - Update 18.3
Microsoft	N/A	Microsoft Exchange Server 2016 Cumulative Update 21
Microsoft	N/A	Microsoft Exchange Server 2016 Cumulative Update 19
Microsoft	N/A	HEVC Video Extensions
Microsoft	N/A	Microsoft Exchange Server 2019 Cumulative Update 8
Microsoft	N/A	Microsoft Malware Protection Engine
Microsoft	N/A	Power BI Report Server
Microsoft	N/A	Visual Studio Code
Microsoft	N/A	Microsoft 365 Apps pour Enterprise pour systèmes 32 bits
Microsoft	N/A	Microsoft 365 Apps pour Enterprise pour 64 bits Systems
Microsoft	N/A	Microsoft Exchange Server 2019 Cumulative Update 10
Microsoft	N/A	Microsoft Dynamics 365 Business Central 2020 Release Wave 1 - Update 16.14
Microsoft	N/A	Microsoft Exchange Server 2016 Cumulative Update 20
Microsoft	N/A	Microsoft Bing Search pour Android
Microsoft	N/A	Microsoft Exchange Server 2019 Cumulative Update 9
Microsoft	N/A	Microsoft Dynamics 365 Business Central 2020 Release Wave 2 - Update 17.8
Microsoft	N/A	Open Enclave SDK

References

Title

Publication Time

CNVD-2021-51485

Vulnerability from cnvd - Published: 2021-07-17

Title

Microsoft Exchange Server远程代码执行漏洞（CNVD-2021-51485）

Description

Microsoft Exchange Server是Microsoft开发的邮件服务器和日历服务器。 Microsoft Exchange Server存在远程代码执行漏洞。攻击者可利用该漏洞实现远程代码执行。

Severity

高

Patch Name

Microsoft Exchange Server远程代码执行漏洞（CNVD-2021-51485）的补丁

Patch Description

Microsoft Exchange Server是Microsoft开发的邮件服务器和日历服务器。 Microsoft Exchange Server存在远程代码执行漏洞。攻击者可利用该漏洞实现远程代码执行。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-34473

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-34473

Impacted products

Name
['Microsoft Exchange Server 2019 Cumulative Update 8', 'Microsoft Exchange Server 2016 Cumulative Update 19', 'Microsoft Exchange Server 2019 Cumulative Update 9', 'Microsoft Exchange Server 2016 Cumulative Update 20', 'Microsoft Exchange Server 2013 Cumulative Update 23']

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-34473",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-34473"
    }
  },
  "description": "Microsoft Exchange Server\u662fMicrosoft\u5f00\u53d1\u7684\u90ae\u4ef6\u670d\u52a1\u5668\u548c\u65e5\u5386\u670d\u52a1\u5668\u3002\n\nMicrosoft Exchange Server\u5b58\u5728\u8fdc\u7a0b\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5b9e\u73b0\u8fdc\u7a0b\u4ee3\u7801\u6267\u884c\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-34473",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-51485",
  "openTime": "2021-07-17",
  "patchDescription": "Microsoft Exchange Server\u662fMicrosoft\u5f00\u53d1\u7684\u90ae\u4ef6\u670d\u52a1\u5668\u548c\u65e5\u5386\u670d\u52a1\u5668\u3002\r\n\r\nMicrosoft Exchange Server\u5b58\u5728\u8fdc\u7a0b\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5b9e\u73b0\u8fdc\u7a0b\u4ee3\u7801\u6267\u884c\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Microsoft Exchange Server\u8fdc\u7a0b\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e\uff08CNVD-2021-51485\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Microsoft Exchange Server 2019 Cumulative Update 8",
      "Microsoft Exchange Server 2016 Cumulative Update 19",
      "Microsoft Exchange Server 2019 Cumulative Update 9",
      "Microsoft Exchange Server 2016 Cumulative Update 20",
      "Microsoft Exchange Server 2013 Cumulative Update 23"
    ]
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-34473",
  "serverity": "\u9ad8",
  "submitTime": "2021-07-15",
  "title": "Microsoft Exchange Server\u8fdc\u7a0b\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e\uff08CNVD-2021-51485\uff09"
}

FKIE_CVE-2021-34473

Vulnerability from fkie_nvd - Published: 2021-07-14 18:15 - Updated: 2026-08-10 19:58

CISA Shadowserver Previdian

Severity

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

Microsoft Exchange Server Remote Code Execution Vulnerability

References

URL	Tags
secure@microsoft.com	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473	Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html	Exploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473	Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.zerodayinitiative.com/advisories/ZDI-21-821/	Third Party Advisory, VDB Entry
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34473	US Government Resource

Impacted products

Vendor	Product	Version
microsoft	exchange_server	2013
microsoft	exchange_server	2016
microsoft	exchange_server	2016
microsoft	exchange_server	2019
microsoft	exchange_server	2019

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2013 Cumulative Update 23",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.00.1497.015",
              "status": "affected",
              "version": "15.00.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2016 Cumulative Update 19",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.01.2176.012",
              "status": "affected",
              "version": "15.01.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2016 Cumulative Update 20",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.01.2242.008",
              "status": "affected",
              "version": "15.01.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2019 Cumulative Update 8",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.02.0792.013",
              "status": "affected",
              "version": "15.02.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2019 Cumulative Update 9",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.02.0858.010",
              "status": "affected",
              "version": "15.02.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "cisaActionDue": "2021-11-17",
  "cisaExploitAdd": "2021-11-03",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Microsoft Exchange Server Remote Code Execution Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*",
              "matchCriteriaId": "DA166F2A-D83B-4D50-AD0B-668D813E0585",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*",
              "matchCriteriaId": "28FCA0E8-7D27-4746-9731-91B834CA3E64",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*",
              "matchCriteriaId": "19C1EE0C-B8DD-4B91-BE4B-1C42D72FB718",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*",
              "matchCriteriaId": "44ECF39A-1DE1-4870-A494-06A53494338D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:*",
              "matchCriteriaId": "71CDF29B-116B-4DE2-AFD0-B62477FF0AEB",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Microsoft Exchange Server Remote Code Execution Vulnerability"
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Ejecuci\u00f3n de C\u00f3digo Remota de Microsoft Exchange Server. Este ID de CVE es diferente de CVE-2021-31196, CVE-2021-31206"
    }
  ],
  "id": "CVE-2021-34473",
  "lastModified": "2026-08-10T19:58:52.800",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 10.0,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "secure@microsoft.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-34473",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-02-04T15:42:23.926450Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-07-14T18:15:11.163",
  "references": [
    {
      "source": "secure@microsoft.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-821/"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34473"
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

GHSA-FGQ9-P33G-XCFC

Vulnerability from github – Published: 2022-05-24 19:07 – Updated: 2026-08-10 18:30

Details

Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2021-34473"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-07-14T18:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.",
  "id": "GHSA-fgq9-p33g-xcfc",
  "modified": "2026-08-10T18:30:39Z",
  "published": "2022-05-24T19:07:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-34473"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473"
    },
    {
      "type": "WEB",
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34473"
    },
    {
      "type": "WEB",
      "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-821"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GSD-2021-34473

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.

Aliases

CVE-2021-34473

Aliases

CVE-2021-34473

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-34473",
    "description": "Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.",
    "id": "GSD-2021-34473",
    "references": [
      "https://packetstormsecurity.com/files/cve/CVE-2021-34473"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-34473"
      ],
      "details": "Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.",
      "id": "GSD-2021-34473",
      "modified": "2023-12-13T01:23:14.071852Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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      "cveID": "CVE-2021-34473",
      "dateAdded": "2021-11-03",
      "dueDate": "2021-11-17",
      "product": "Microsoft Exchange Server",
      "requiredAction": "Apply updates per vendor instructions.",
      "shortDescription": "Microsoft Exchange Server Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.",
      "vendorProject": "Microsoft",
      "vulnerabilityName": "Microsoft Exchange Server Remote Code Execution Vulnerability"
    },
    "cve.org": {
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        "ASSIGNER": "secure@microsoft.com",
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        "STATE": "PUBLIC"
      },
      "affects": {
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          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Microsoft Exchange Server 2013 Cumulative Update 23",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "15.00.0",
                          "version_value": "15.00.1497.015"
                        }
                      ]
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                  },
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                    }
                  },
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                      ]
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                  },
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                          "version_value": "15.01.2176.012"
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                      ]
                    }
                  },
                  {
                    "product_name": "Microsoft Exchange Server 2019 Cumulative Update 8",
                    "version": {
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                        {
                          "version_affected": "\u003c",
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              },
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            }
          ]
        }
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          }
        ]
      },
      "impact": {
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            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "Remote Code Execution"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473",
            "refsource": "MISC",
            "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473"
          },
          {
            "name": "https://www.zerodayinitiative.com/advisories/ZDI-21-821/",
            "refsource": "MISC",
            "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-821/"
          },
          {
            "name": "http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html",
            "refsource": "MISC",
            "url": "http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "cisaActionDue": "2021-11-17",
        "cisaExploitAdd": "2021-11-03",
        "cisaRequiredAction": "Apply updates per vendor instructions.",
        "cisaVulnerabilityName": "Microsoft Exchange Server Remote Code Execution Vulnerability",
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*",
                    "matchCriteriaId": "DA166F2A-D83B-4D50-AD0B-668D813E0585",
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                  },
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                  },
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                  },
                  {
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                  }
                ],
                "negate": false,
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              }
            ]
          }
        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "Microsoft Exchange Server Remote Code Execution Vulnerability"
          },
          {
            "lang": "es",
            "value": "Una vulnerabilidad de Ejecuci\u00f3n de C\u00f3digo Remota de Microsoft Exchange Server. Este ID de CVE es diferente de CVE-2021-31196, CVE-2021-31206"
          }
        ],
        "id": "CVE-2021-34473",
        "lastModified": "2023-12-28T23:15:32.450",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "HIGH",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "COMPLETE",
                "baseScore": 10.0,
                "confidentialityImpact": "COMPLETE",
                "integrityImpact": "COMPLETE",
                "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
                "version": "2.0"
              },
              "exploitabilityScore": 10.0,
              "impactScore": 10.0,
              "obtainAllPrivilege": false,
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              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
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                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
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                "baseScore": 9.1,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
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              "source": "secure@microsoft.com",
              "type": "Primary"
            },
            {
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                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
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                "baseScore": 9.8,
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                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
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              "source": "nvd@nist.gov",
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            }
          ]
        },
        "published": "2021-07-14T18:15:11.163",
        "references": [
          {
            "source": "secure@microsoft.com",
            "tags": [
              "Exploit",
              "Third Party Advisory",
              "VDB Entry"
            ],
            "url": "http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html"
          },
          {
            "source": "secure@microsoft.com",
            "tags": [
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          },
          {
            "source": "secure@microsoft.com",
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              "VDB Entry"
            ],
            "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-821/"
          }
        ],
        "sourceIdentifier": "secure@microsoft.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-918"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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    }
  }
}

WID-SEC-W-2024-1897

Vulnerability from csaf_certbund - Published: 2021-07-13 22:00 - Updated: 2024-08-21 22:00

Summary

Microsoft Exchange Server: Mehrere Schwachstellen

Severity

Hoch

Scope

7 vulnerabilities in this advisory, including CVE-2021-34473.

CVE-2021-34473

In Microsoft Exchange Server 2013, Microsoft Exchange Server 2016 und Microsoft Exchange Server 2019 existieren mehrere nicht näher beschriebene Schwachstellen. Ein Angreifer kann dies ausnutzen, um beliebigen Code auszuführen, um seine Privilegien zu erhöhen und um Informationen offenzulegen. Einige dieser Schwachstellen können von einem entfernten, anonymen Angreifer ausgenutzt werden. Die Ausnutzung einiger dieser Schwachstellen erfordert keine Nutzer-Interaktion.

Known affected: 5 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-34473 (GCVE-0-2021-34473)

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Vendor Report Successful Exploitation Confidence: 80% Source: cisa-kev

Details

References

Shadowserver

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Characteristics

Timestamps

Scope

Evidence

Honeypot In The Wild Attempts Confidence: 70% Source: shadowserver

Details

References

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Public Report Confirmed Compromise Confidence: 70% Source: kevintel

Details

References

BDU:2021-04125 (CVE-2021-34473)

CERTFR-2021-ALE-017

Solution

CERTFR-2021-AVI-522

Solution

CNVD-2021-51485

FKIE_CVE-2021-34473

GHSA-FGQ9-P33G-XCFC

GSD-2021-34473

WID-SEC-W-2024-1897

Tags

Sightings

Nomenclature

Related by attack behaviour