CVE catalog

CVE-2021-3181

mutt affected and fixed versions

rfc822.c in Mutt through 2.0.4 allows remote attackers to cause a denial of service (mailbox unavailability) by sending email messages with sequences of semicolon characters in RFC822 address fields (aka terminators of empty groups). A small email message from the attacker can cause large memory consumption, and the victim may then be unable to see email messages from other persons.

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published: Jan 19, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.83% · Oct 27, 2026

Projects and upstream resources

[mutt][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiantrixie-security	mutt	`2.2.13-1+deb13u2`	Fixed	[CVE-2021-3181]
Debiantrixie	mutt	`2.0.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-3181]
Debiantrixie	mutt	`2.2.13-1+deb13u1`	Fixed	[CVE-2021-3181]
Debiansid	mutt	`2.0.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-3181]
Debiansid	mutt	`2.4.1-1.1`	Fixed	[CVE-2021-3181]
Debianforky	mutt	`2.0.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-3181]
Debianforky	mutt	`2.4.1-1`	Fixed	[CVE-2021-3181]
Debianbookworm-security	mutt	`2.2.9-1+deb12u1`	Fixed	[CVE-2021-3181]
Debianbookworm	mutt	`2.0.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-3181]
Debianbookworm	mutt	`2.2.12-0.1~deb12u1`	Fixed	[CVE-2021-3181]

Showing 10 fix observations. All 48 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
Debianbookworm	mutt	`2.0.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-3181]
Debianbookworm	mutt	`2.2.12-0.1~deb12u1`	Fixed	[CVE-2021-3181]
Debianbookworm-security	mutt	`2.2.9-1+deb12u1`	Fixed	[CVE-2021-3181]
Debianforky	mutt	`2.0.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-3181]
Debianforky	mutt	`2.4.1-1`	Fixed	[CVE-2021-3181]
Debiansid	mutt	`2.0.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-3181]
Debiansid	mutt	`2.4.1-1.1`	Fixed	[CVE-2021-3181]
Debiantrixie	mutt	`2.0.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-3181]
Debiantrixie	mutt	`2.2.13-1+deb13u1`	Fixed	[CVE-2021-3181]
Debiantrixie-security	mutt	`2.2.13-1+deb13u2`	Fixed	[CVE-2021-3181]
Opensuseleap 15.1	mutt	`1.10.1-lp151.2.15.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2021:0161-1]Feb 4, 2026, 4:11:49 AM UTC
Opensuseleap 15.2	mutt	`1.10.1-lp152.3.15.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2021:0162-1]Feb 4, 2026, 3:55:57 AM UTC
Suselinux enterprise module for basesystem 15 sp2	mutt	`1.10.1-3.20.1`	UnknownSource applicability is not established	[SUSE-SU-2021:0195-1]Feb 4, 2026, 4:14:45 AM UTC
Suselinux enterprise server 12 sp5	mutt	`1.10.1-55.24.1`	UnknownSource applicability is not established	[SUSE-SU-2021:0196-1]Feb 4, 2026, 2:14:28 AM UTC
Suselinux enterprise server for sap applications 12 sp5	mutt	`1.10.1-55.24.1`	UnknownSource applicability is not established	[SUSE-SU-2021:0196-1]Feb 4, 2026, 2:14:28 AM UTC
Ubuntu16.04	mutt	`1.5.23-3.1ubuntu1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu16.04	mutt	`1.5.23-3.1ubuntu2`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu16.04	mutt	`1.5.24-1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu16.04	mutt	`1.5.24-1build1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu16.04	mutt	`1.5.24-1ubuntu0.1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu16.04	mutt	`1.5.24-1ubuntu0.2`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu16.04	mutt	`1.5.24-1ubuntu0.3`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu16.04	mutt	`1.5.24-1ubuntu0.4`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu16.04	mutt	`1.5.24-1ubuntu0.5`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu16.04	mutt	`1.5.24-1ubuntu0.6`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.8.3+neomutt20170609-2build1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.1-2`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.1-3`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.1-4`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.1-5`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.2-1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.3-1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.4-2`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.4-3`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.4-3ubuntu0.1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.4-3ubuntu0.2`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.4-3ubuntu0.3`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.4-3ubuntu0.4`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu18.04	mutt	`1.9.4-3ubuntu0.5`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu20.04	mutt	`1.10.1-2.1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu20.04	mutt	`1.12.2-1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu20.04	mutt	`1.12.2-2`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu20.04	mutt	`1.13.0-1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu20.04	mutt	`1.13.2-1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu20.04	mutt	`1.13.2-1ubuntu0.1`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu20.04	mutt	`1.13.2-1ubuntu0.2`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu20.04	mutt	`1.13.2-1ubuntu0.3`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC
Ubuntu20.04	mutt	`1.13.2-1ubuntu0.4`	UnknownSource applicability is not established	[USN-4703-1]Feb 10, 2026, 4:42:02 AM UTC[UBUNTU-CVE-2021-3181]Feb 4, 2026, 4:03:09 AM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "mutt",
      "status": "fixed",
      "release": "sid",
      "version": "2.4.1-1.1"
    },
    {
      "name": "mutt",
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      "release": "forky",
      "version": "2.4.1-1"
    },
    {
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    },
    {
      "name": "mutt",
      "status": "fixed",
      "release": "trixie-security",
      "version": "2.2.13-1+deb13u2"
    },
    {
      "name": "mutt",
      "status": "fixed",
      "release": "bookworm",
      "version": "2.2.12-0.1~deb12u1"
    },
    {
      "name": "mutt",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "2.2.9-1+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 980326,
      "name": "mutt",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.0.5-1"
    },
    {
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      "name": "mutt",
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    },
    {
      "bug": 980326,
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      "type": "source",
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    },
    {
      "bug": 980326,
      "name": "mutt",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
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    }
  ],
  "distribution_packages": [
    {
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      "ranges": [
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          "type": "ECOSYSTEM",
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            },
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      "provider_record_id": "USN-4703-1",
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    },
    {
      "name": "mutt",
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        {
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      "release": "18.04",
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        "1.9.4-3ubuntu0.3",
        "1.9.4-3ubuntu0.4"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/USN-4703-1",
      "fixed_version": "1.9.4-3ubuntu0.5",
      "provider_source": "pypi",
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      "provider_updated_at": "2026-02-10T04:42:02Z",
      "applicability_unknown": true
    },
    {
      "name": "mutt",
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      "provider_source": "pypi",
      "provider_record_id": "USN-4703-1",
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    },
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        }
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      "release": "linux enterprise module for basesystem 15 sp2",
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    },
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          ]
        }
      ],
      "release": "leap 15.1",
      "versions": [],
      "ecosystem": "rpm",
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        "1.5.24-1ubuntu0.5"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-3181",
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    },
    {
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          ]
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      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-3181",
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      "provider_record_id": "UBUNTU-CVE-2021-3181",
      "provider_updated_at": "2026-02-04T04:03:09.979125Z",
      "applicability_unknown": true
    },
    {
      "name": "mutt",
      "distro": "ubuntu",
      "ranges": [
        {
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      ],
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      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-3181",
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      "provider_record_id": "UBUNTU-CVE-2021-3181",
      "provider_updated_at": "2026-02-04T04:03:09.979125Z",
      "applicability_unknown": true
    },
    {
      "name": "mutt",
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      "ranges": [
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          "type": "ECOSYSTEM",
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          ]
        }
      ],
      "release": "leap 15.2",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2021:0162-1",
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    {
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            },
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            }
          ]
        }
      ],
      "release": "linux enterprise server 12 sp5",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:0196-1",
      "fixed_version": "1.10.1-55.24.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:0196-1",
      "provider_updated_at": "2026-02-04T02:14:28.878475Z",
      "applicability_unknown": true
    },
    {
      "name": "mutt",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.10.1-55.24.1"
            }
          ]
        }
      ],
      "release": "linux enterprise server for sap applications 12 sp5",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2021:0196-1",
      "fixed_version": "1.10.1-55.24.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2021:0196-1",
      "provider_updated_at": "2026-02-04T02:14:28.878475Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #980326]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[mutt]Unknown
Details (4)
- 2.2.12-0.1~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 2.0.5-1
  dsa · mutt · debian · bookworm; dsa · mutt · debian · 12
- 2.2.12-0.1~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 2.0.5-1
  dsa · mutt · debian · bookworm; dsa · mutt · debian · 12
- 2.2.9-1+deb12u1 · amd64 · bookworm-security
  Fixed · Fixed: 2.0.5-1
  dsa · mutt · debian · bookworm; dsa · mutt · debian · 12
- 2.2.9-1+deb12u1 · arm64 · bookworm-security
  Fixed · Fixed: 2.0.5-1
  dsa · mutt · debian · bookworm; dsa · mutt · debian · 12

[Debian 13 (Trixie)]

[mutt]Unknown
Details (3)
- 2.2.13-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 2.0.5-1
  dsa · mutt · debian · 13
- 2.2.13-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 2.0.5-1
  dsa · mutt · debian · 13
- 2.2.13-1+deb13u2 · amd64 · trixie-security
  Fixed · Fixed: 2.0.5-1
  dsa · mutt · debian · 13

Observed: Oct 23, 2026, 5:56:55 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]