Vulnerability-Lookup

CVE-2021-36386 (GCVE-0-2021-36386)

Vulnerability from cvelistv5 – Published: 2021-07-29 13:59 – Updated: 2024-08-04 00:54

Summary

report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages. NOTE: it is unclear whether use of Fetchmail on any realistic platform results in an impact beyond an inconvenience to the client user.

Severity

7.5 (High)


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

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 28/100 over 2339 records in the last 180 days details

References

7 references

URL	Tags
https://www.fetchmail.info/security.html	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2021/07/28/5	x_refsource_MISC
https://www.fetchmail.info/fetchmail-SA-2021-01.txt	x_refsource_CONFIRM
http://www.openwall.com/lists/oss-security/2021/08/09/1	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202209-14	vendor-advisoryx_refsource_GENTOO

Show details on NVD website

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OPENSUSE-SU-2021:2791-1

Vulnerability from csaf_opensuse - Published: 2021-08-20 08:14 - Updated: 2026-09-20 19:34

Summary

Security update for fetchmail

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-36386.

CVE-2021-36386

5.1 (Medium)


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

Recommended: 8 products

Open the full advisory

OPENSUSE-SU-2021:4018-1

Vulnerability from csaf_opensuse - Published: 2021-12-14 07:58 - Updated: 2026-09-20 19:37

Summary

Security update for fetchmail

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-36386.

CVE-2021-36386

5.1 (Medium)


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

Recommended: 8 products

Open the full advisory

OPENSUSE-SU-2024:10753-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2026-09-20 20:04

Summary

fetchmail-6.4.21-2.1 on GA media

Severity

Moderate

Scope

6 vulnerabilities in this advisory, including CVE-2021-36386.

CVE-2021-36386

5.1 (Medium)


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

Recommended: 8 products

Open the full advisory

RHSA-2022:1964

Vulnerability from csaf_opensuse - Published: 2022-05-10 00:00 - Updated: 2026-09-20 11:20

Summary

security update for fetchmail

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-36386.

CVE-2021-36386

5.1 (Medium)


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

Recommended: 1 product

Open the full advisory

SUSE-SU-2021:2771-1

Vulnerability from csaf_suse - Published: 2021-08-18 07:46 - Updated: 2026-09-20 14:03

Summary

Security update for fetchmail

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-36386.

CVE-2021-36386

5.1 (Medium)


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

Recommended: 92 products

Open the full advisory

SUSE-SU-2021:2791-1

Vulnerability from csaf_suse - Published: 2021-08-20 08:15 - Updated: 2026-09-20 14:03

Summary

Security update for fetchmail

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-36386.

CVE-2021-36386

5.1 (Medium)


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

Recommended: 168 products

Open the full advisory

SUSE-SU-2021:4018-1

Vulnerability from csaf_suse - Published: 2021-12-14 07:59 - Updated: 2026-09-20 14:11

Summary

Security update for fetchmail

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-36386.

CVE-2021-36386

5.1 (Medium)


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

Recommended: 158 products

Open the full advisory

SUSE-SU-2024:3006-1

Vulnerability from csaf_suse - Published: 2024-08-23 14:46 - Updated: 2026-09-20 16:04

Summary

Security update for fetchmail

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-36386.

CVE-2021-36386

5.1 (Medium)


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

Recommended: 24 products

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UBUNTU-CVE-2021-36386 (CVE-2021-36386)

Vulnerability from osv_ubuntu – Published: 2021-07-30 14:15 – Updated: 2025-10-24 04:50 – Source website

Details

Severity

7.5 (High)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2021-36386	REPORT
	https://www.fetchmail.info/fetchmail-SA-2021-01.txt	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-36386	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fetchmail",
            "binary_version": "6.3.26-2"
          },
          {
            "binary_name": "fetchmailconf",
            "binary_version": "6.3.26-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "fetchmail",
        "purl": "pkg:deb/ubuntu/fetchmail@6.3.26-2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.3.26-1",
        "6.3.26-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fetchmail",
            "binary_version": "6.3.26-3ubuntu0.1~18.04.1"
          },
          {
            "binary_name": "fetchmailconf",
            "binary_version": "6.3.26-3ubuntu0.1~18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "fetchmail",
        "purl": "pkg:deb/ubuntu/fetchmail@6.3.26-3ubuntu0.1~18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.3.26-3",
        "6.3.26-3build1",
        "6.3.26-3ubuntu0.1~18.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fetchmail",
            "binary_version": "6.4.2-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "fetchmail",
        "purl": "pkg:deb/ubuntu/fetchmail@6.4.2-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.4.0~rc4-1ubuntu1",
        "6.4.1-1ubuntu1",
        "6.4.2-2"
      ]
    }
  ],
  "aliases": [],
  "details": "report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages. NOTE: it is unclear whether use of Fetchmail on any realistic platform results in an impact beyond an inconvenience to the client user.",
  "id": "UBUNTU-CVE-2021-36386",
  "modified": "2025-10-24T04:50:26Z",
  "published": "2021-07-30T14:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-36386"
    },
    {
      "type": "REPORT",
      "url": "https://www.fetchmail.info/fetchmail-SA-2021-01.txt"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-36386"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-36386"
  ]
}

WID-SEC-W-2022-1525

Vulnerability from csaf_certbund - Published: 2021-07-28 22:00 - Updated: 2024-08-25 22:00

Summary

fetchmail: Schwachstelle ermöglicht Denial of Service

Severity

Hoch

Scope

1 vulnerability in this advisory, including CVE-2021-36386.

CVE-2021-36386

Es existiert eine Schwachstelle in fetchmail. Der Fehler tritt bei der Verarbeitung von langen Log-Daten auf. Ein lokaler Angreifer kann diese Schwachstelle ausnutzen, um einen Denial of Service Zustand herbeizuführen oder Informationen offenzulegen.

Known affected: 4 products

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Author	Source	Type	Date	Other

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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.

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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.
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CVE-2021-36386 (GCVE-0-2021-36386)

UBUNTU-CVE-2021-36386 (CVE-2021-36386)

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