Vulnerability-Lookup

CVE-2021-20231 (GCVE-0-2021-20231)

Vulnerability from cvelistv5 – Published: 2021-03-12 18:23 – Updated: 2024-08-03 17:30

Summary

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

Severity

9.8 (Critical)


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

CWE

CWE-416

Assigner

redhat redhat root

References

12 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1922276	x_refsource_MISC
https://www.gnutls.org/security-new.html#GNUTLS-S…	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.apache.org/thread.html/r5f88bed4477…	mailing-listx_refsource_MLIST
https://security.netapp.com/advisory/ntap-2021041…	x_refsource_CONFIRM
https://lists.apache.org/thread.html/rcd70a4c88a4…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r5d4001031e7…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r9cbc69e5727…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rfd5273d72d2…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf5e1256d870…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r50661d6f008…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r6ac143ba6dd…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version	CPE status
n/a	gnutls	Affected: gnutls 3.7.1

Show details on NVD website

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                "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": "Primary"
            }
          ]
        },
        "published": "2021-03-12T19:15:13.037",
        "references": [
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Issue Tracking",
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1922276"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.apache.org/thread.html/r50661d6f0082709aad9a584431b59ec364f9974b63b07e0800230168%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.apache.org/thread.html/r5d4001031e7790d8c6396c499522b4ed2aab782da87b1a14184793bb%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.apache.org/thread.html/r5f88bed447742fcc5c47bf1c7be965ef450131914a6e1f85feba2779%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.apache.org/thread.html/r6ac143ba6dd98bd4bf6bf010d46e56e254056459721ba18822d611f7%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.apache.org/thread.html/r9cbc69e57276413788e90a6ee16c7c034ea4258d31935b70db2bd158%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.apache.org/thread.html/rcd70a4c88a47a75fd2d5f3ffb7cee8c2a18c713320bd90fdcb57495f%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.apache.org/thread.html/rf5e1256d870193def4a82ad89ab95e63943a313b5ff0d81aa87e4532%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.apache.org/thread.html/rfd5273d72d244178441e6904a2f2b41a3268f569e8092ea0b3b2bb20%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OSLAE6PP33A7VYRYMYMUVB3U6B26GZER/"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20210416-0005/"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Exploit",
              "Vendor Advisory"
            ],
            "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Issue Tracking",
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1922276"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/r50661d6f0082709aad9a584431b59ec364f9974b63b07e0800230168%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/r5d4001031e7790d8c6396c499522b4ed2aab782da87b1a14184793bb%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/r5f88bed447742fcc5c47bf1c7be965ef450131914a6e1f85feba2779%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/r6ac143ba6dd98bd4bf6bf010d46e56e254056459721ba18822d611f7%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/r9cbc69e57276413788e90a6ee16c7c034ea4258d31935b70db2bd158%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/rcd70a4c88a47a75fd2d5f3ffb7cee8c2a18c713320bd90fdcb57495f%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/rf5e1256d870193def4a82ad89ab95e63943a313b5ff0d81aa87e4532%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/rfd5273d72d244178441e6904a2f2b41a3268f569e8092ea0b3b2bb20%40%3Cissues.spark.apache.org%3E"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OSLAE6PP33A7VYRYMYMUVB3U6B26GZER/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20210416-0005/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Exploit",
              "Vendor Advisory"
            ],
            "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10"
          }
        ],
        "sourceIdentifier": "secalert@redhat.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "secalert@redhat.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-26T19:51:23+00:00",
      "cve": "CVE-2021-20231",
      "id": "CVE-2021-20231",
      "initial_release_date": "2021-03-12T09:49:00+00:00",
      "product_status:fixed": "106",
      "product_status:known_not_affected": "17",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "gnutls: Use after free in client key_share extension",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-20231.json",
      "version": "3"
    }
  }
}

OPENSUSE-SU-2021:0470-1

Vulnerability from csaf_opensuse - Published: 2021-03-25 08:10 - Updated: 2021-03-25 08:10

Summary

Security update for gnutls

Severity

Important

Scope

2 vulnerabilities in this advisory, including CVE-2021-20231.

CVE-2021-20231

7.4 (High)


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

Recommended: 21 products

Open the full advisory

RHSA-2021:4451

Vulnerability from csaf_redhat - Published: 2021-11-09 18:09 - Updated: 2026-06-26 19:51

Summary

Red Hat Security Advisory: gnutls and nettle security, bug fix, and enhancement update

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2021-20231.

CVE-2021-20231

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and denial of service.

3.7 (Low)


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

Fixed: 106 products

https://access.redhat.com/errata/RHSA-2021:4451

Open the full advisory

SSA-398330

Vulnerability from csaf_siemens - Published: 2023-12-12 00:00 - Updated: 2025-08-12 00:00

Summary

SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

Scope

544 vulnerabilities in this advisory, including CVE-2021-20231.

CVE-2021-20231

9.8 (Critical)


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

Known affected: 5 products

https://support.industry.siemens.com/cs/ww/en/view/109478459/

Open the full advisory

SUSE-SU-2021:0934-1

Vulnerability from csaf_suse - Published: 2021-03-24 11:18 - Updated: 2021-03-24 11:18

Summary

Security update for gnutls

Severity

Important

Scope

2 vulnerabilities in this advisory, including CVE-2021-20231.

CVE-2021-20231

7.4 (High)


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

Recommended: 194 products

Open the full advisory

SUSE-SU-2021:0935-1

Vulnerability from csaf_suse - Published: 2021-03-24 11:19 - Updated: 2021-03-24 11:19

Summary

Security update for gnutls

Severity

Important

Scope

2 vulnerabilities in this advisory, including CVE-2021-20231.

CVE-2021-20231

7.4 (High)


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

Recommended: 28 products

Open the full advisory

UBUNTU-CVE-2021-20231 (CVE-2021-20231)

Vulnerability from osv_ubuntu – Published: 2021-03-12 19:15 – Updated: 2026-04-22 07:39 – Source website

Details

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

Severity

9.8 (Critical)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2021-20231	REPORT
	https://www.gnutls.org/security-new.html#GNUTLS-S…	REPORT
	https://ubuntu.com/security/notices/USN-5029-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-20231	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gnutls-bin",
            "binary_version": "3.6.13-2ubuntu1.6"
          },
          {
            "binary_name": "guile-gnutls",
            "binary_version": "3.6.13-2ubuntu1.6"
          },
          {
            "binary_name": "libgnutls-dane0",
            "binary_version": "3.6.13-2ubuntu1.6"
          },
          {
            "binary_name": "libgnutls-openssl27",
            "binary_version": "3.6.13-2ubuntu1.6"
          },
          {
            "binary_name": "libgnutls30",
            "binary_version": "3.6.13-2ubuntu1.6"
          },
          {
            "binary_name": "libgnutlsxx28",
            "binary_version": "3.6.13-2ubuntu1.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "gnutls28",
        "purl": "pkg:deb/ubuntu/gnutls28@3.6.13-2ubuntu1.6?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.13-2ubuntu1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.6.9-5ubuntu1",
        "3.6.9-5ubuntu2",
        "3.6.10-5",
        "3.6.11.1-2",
        "3.6.11.1-2ubuntu2",
        "3.6.13-2ubuntu1",
        "3.6.13-2ubuntu1.1",
        "3.6.13-2ubuntu1.2",
        "3.6.13-2ubuntu1.3"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.",
  "id": "UBUNTU-CVE-2021-20231",
  "modified": "2026-04-22T07:39:53Z",
  "published": "2021-03-12T19:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-20231"
    },
    {
      "type": "REPORT",
      "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5029-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-20231"
    }
  ],
  "related": [
    "USN-5029-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-20231"
  ]
}

VDE-2022-010

Vulnerability from csaf_phoenixcontactgmbhcokg - Published: 2022-04-12 06:00 - Updated: 2025-05-22 13:03

Summary

PHOENIX CONTACT: Multiple Linux component vulnerabilities fixed in latest AXC F x152 LTS release

Scope

60 vulnerabilities in this advisory, including CVE-2021-20231.

CVE-2021-20231

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

9.8 (Critical)


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

Known affected: 4 products Fixed: 4 products

Open the full advisory

WID-SEC-W-2026-3127

Vulnerability from csaf_certbund - Published: 2021-03-14 23:00 - Updated: 2026-08-31 22:00

Summary

GnuTLS: Mehrere Schwachstellen

Severity

Mittel

Scope

2 vulnerabilities in this advisory, including CVE-2021-20231.

CVE-2021-20231

Known affected: 7 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-2021-20231 (GCVE-0-2021-20231)

OPENSUSE-SU-2021:0470-1

RHSA-2021:4451

SSA-398330

SUSE-SU-2021:0934-1

SUSE-SU-2021:0935-1

UBUNTU-CVE-2021-20231 (CVE-2021-20231)

VDE-2022-010

WID-SEC-W-2026-3127

Tags

Sightings

Nomenclature

Related by attack behaviour