CVE catalog

CVE-2021-34337

mailman3 affected and fixed versions

An issue was discovered in Mailman Core before 3.3.5. An attacker with access to the REST API could use timing attacks to determine the value of the configured REST API password and then make arbitrary REST API calls. The REST API is bound to localhost by default, limiting the ability for attackers to exploit this, but can optionally be made to listen on other interfaces.

Severity: High · CVSS 7.4CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Dec 4, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.30% · Oct 27, 2026

Projects and upstream resources

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	mailman3	`3.3.10-2`	Fixed	[CVE-2021-34337]
Debiantrixie	mailman3	`3.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2021-34337]
Debiansid	mailman3	`3.3.10-6`	Fixed	[CVE-2021-34337]
Debiansid	mailman3	`3.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2021-34337]
Debianforky	mailman3	`3.3.10-6`	Fixed	[CVE-2021-34337]
Debianforky	mailman3	`3.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2021-34337]
Debianbookworm	mailman3	`3.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2021-34337]
Debianbookworm	mailman3	`3.3.8-2~deb12u2`	Fixed	[CVE-2021-34337]

Showing 8 fix observations. All 15 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
Debianbookworm	mailman3	`3.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2021-34337]
Debianbookworm	mailman3	`3.3.8-2~deb12u2`	Fixed	[CVE-2021-34337]
Debianforky	mailman3	`3.3.10-6`	Fixed	[CVE-2021-34337]
Debianforky	mailman3	`3.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2021-34337]
Debiansid	mailman3	`3.3.10-6`	Fixed	[CVE-2021-34337]
Debiansid	mailman3	`3.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2021-34337]
Debiantrixie	mailman3	`3.3.10-2`	Fixed	[CVE-2021-34337]
Debiantrixie	mailman3	`3.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2021-34337]
Opensusetumbleweed	mailman3	`3.3.5-2.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2024:11760-1]Feb 4, 2026, 2:41:00 AM UTC
Opensusetumbleweed	python3-mailman	`3.3.5-1.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2024:11644-1]Feb 4, 2026, 3:20:47 AM UTC
Ubuntu18.04	mailman3	`3.1.1-7`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-34337]Oct 24, 2025, 4:50:24 AM UTC
Ubuntu18.04	mailman3	`3.1.1-8`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-34337]Oct 24, 2025, 4:50:24 AM UTC
Ubuntu18.04	mailman3	`3.1.1-9`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-34337]Oct 24, 2025, 4:50:24 AM UTC
Ubuntu20.04	mailman3	`3.2.1-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-34337]Oct 24, 2025, 4:50:24 AM UTC
Ubuntu20.04	mailman3	`3.2.2-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-34337]Oct 24, 2025, 4:50:24 AM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "mailman3",
      "status": "fixed",
      "release": "sid",
      "version": "3.3.10-6"
    },
    {
      "name": "mailman3",
      "status": "fixed",
      "release": "forky",
      "version": "3.3.10-6"
    },
    {
      "name": "mailman3",
      "status": "fixed",
      "release": "trixie",
      "version": "3.3.10-2"
    },
    {
      "name": "mailman3",
      "status": "fixed",
      "release": "bookworm",
      "version": "3.3.8-2~deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1004934,
      "name": "mailman3",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "3.3.7-1"
    },
    {
      "bug": 1004934,
      "name": "mailman3",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "3.3.7-1"
    },
    {
      "bug": 1004934,
      "name": "mailman3",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "3.3.7-1"
    },
    {
      "bug": 1004934,
      "name": "mailman3",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "3.3.7-1"
    }
  ],
  "distribution_packages": [
    {
      "name": "python3-mailman",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.5-1.1"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2024:11644-1",
      "fixed_version": "3.3.5-1.1",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2024:11644-1",
      "provider_updated_at": "2026-02-04T03:20:47.592900Z",
      "applicability_unknown": true
    },
    {
      "name": "mailman3",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2024:11760-1",
      "fixed_version": "3.3.5-2.1",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2024:11760-1",
      "provider_updated_at": "2026-02-04T02:41:00.058670Z",
      "applicability_unknown": true
    },
    {
      "name": "mailman3",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "3.1.1-7",
        "3.1.1-8",
        "3.1.1-9"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-34337",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-34337",
      "provider_updated_at": "2025-10-24T04:50:24Z",
      "applicability_unknown": true
    },
    {
      "name": "mailman3",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "20.04",
      "versions": [
        "3.2.1-1",
        "3.2.2-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-34337",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-34337",
      "provider_updated_at": "2025-10-24T04:50:24Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #1004934]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[mailman3]Unknown
Details (2)
- 3.3.8-2~deb12u2 · all · bookworm
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · bookworm; dsa · mailman3 · debian · 12
- 3.3.8-2~deb12u2 · all · bookworm
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · bookworm; dsa · mailman3 · debian · 12
[mailman3-doc]Unknown
Source package: [mailman3]
Details (2)
- 3.3.8-2~deb12u2 · all · bookworm
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · bookworm; dsa · mailman3 · debian · 12
- 3.3.8-2~deb12u2 · all · bookworm
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · bookworm; dsa · mailman3 · debian · 12
[mailman3-full]Unknown
Source package: [mailman3]
Details (2)
- 3.3.8-2~deb12u2 · all · bookworm
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · bookworm; dsa · mailman3 · debian · 12
- 3.3.8-2~deb12u2 · all · bookworm
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · bookworm; dsa · mailman3 · debian · 12

[Debian 13 (Trixie)]

[mailman3]Unknown
Details (2)
- 3.3.10-2 · all · trixie
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · 13
- 3.3.10-2 · all · trixie
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · 13
[mailman3-doc]Unknown
Source package: [mailman3]
Details (2)
- 3.3.10-2 · all · trixie
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · 13
- 3.3.10-2 · all · trixie
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · 13
[mailman3-full]Unknown
Source package: [mailman3]
Details (2)
- 3.3.10-2 · all · trixie
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · 13
- 3.3.10-2 · all · trixie
  Fixed · Fixed: 3.3.7-1
  dsa · mailman3 · debian · 13

[openSUSE Tumbleweed]

[mailman3]Unknown
Source package: [python-mailman]
Details (1)
- 3.3.10-3.5 · noarch · tumbleweed
  Fixed · Fixed: 3.3.5-2.1
  dsa · mailman3 · opensuse · tumbleweed

Observed: Oct 23, 2026, 5:58:10 PM UTC

References

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