CVE catalog

CVE-2021-32921

prosody affected and fixed versions

[CVE catalog]

An issue was discovered in Prosody before 0.11.9. It does not use a constant-time algorithm for comparing certain secret strings when running under Lua 5.2 or later. This can potentially be used in a timing attack to reveal the contents of secret strings to an attacker.

Severity
Medium · CVSS 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
Source
[NVD] · [CVE record]
EPSS
1.60% · 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 / releasePackageVersionStatusSource
Debiantrixie-securityprosody13.0.1-1+deb131uFixed[CVE-2021-32921]
Debiantrixieprosody0.11.9-1FixedDistribution-reported fixed boundary[CVE-2021-32921]
Debiantrixieprosody13.0.1-1+deb131uFixed[CVE-2021-32921]
Debiansidprosody0.11.9-1FixedDistribution-reported fixed boundary[CVE-2021-32921]
Debiansidprosody13.0.7-1Fixed[CVE-2021-32921]
Debianforkyprosody0.11.9-1FixedDistribution-reported fixed boundary[CVE-2021-32921]
Debianforkyprosody13.0.7-1Fixed[CVE-2021-32921]
Debianbookworm-securityprosody0.12.3-1+deb12u1Fixed[CVE-2021-32921]
Debianbookwormprosody0.11.9-1FixedDistribution-reported fixed boundary[CVE-2021-32921]
Debianbookwormprosody0.12.3-1+deb12u1Fixed[CVE-2021-32921]

Showing 10 fix observations. All 27 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
Debianbookwormprosody0.11.9-1FixedDistribution-reported fixed boundary[CVE-2021-32921]
Debianbookwormprosody0.12.3-1+deb12u1Fixed[CVE-2021-32921]
Debianbookworm-securityprosody0.12.3-1+deb12u1Fixed[CVE-2021-32921]
Debianforkyprosody0.11.9-1FixedDistribution-reported fixed boundary[CVE-2021-32921]
Debianforkyprosody13.0.7-1Fixed[CVE-2021-32921]
Debiansidprosody0.11.9-1FixedDistribution-reported fixed boundary[CVE-2021-32921]
Debiansidprosody13.0.7-1Fixed[CVE-2021-32921]
Debiantrixieprosody0.11.9-1FixedDistribution-reported fixed boundary[CVE-2021-32921]
Debiantrixieprosody13.0.1-1+deb131uFixed[CVE-2021-32921]
Debiantrixie-securityprosody13.0.1-1+deb131uFixed[CVE-2021-32921]
Ubuntu16.04prosody0.9.10-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu16.04prosody0.9.8-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu16.04prosody0.9.9-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu20.04prosody0.11.2-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu20.04prosody0.11.3-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu20.04prosody0.11.4-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu22.04prosody0.11.10-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu22.04prosody0.11.10-1build1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu22.04prosody0.11.10-1build2UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu22.04prosody0.11.11-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu22.04prosody0.11.11-2UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu22.04prosody0.11.12-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntu22.04prosody0.11.13-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntuproprosody0.10.0-1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntuproprosody0.10.0-1build1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntuproprosody0.10.0-1ubuntu0.1~esm1UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Ubuntuproprosody0.9.12-2UnknownSource applicability is not established[UBUNTU-CVE-2021-32921]
Original provider fields
{
  "package_releases": [
    {
      "name": "prosody",
      "status": "fixed",
      "release": "sid",
      "version": "13.0.7-1"
    },
    {
      "name": "prosody",
      "status": "fixed",
      "release": "forky",
      "version": "13.0.7-1"
    },
    {
      "name": "prosody",
      "status": "fixed",
      "release": "trixie",
      "version": "13.0.1-1+deb131u"
    },
    {
      "name": "prosody",
      "status": "fixed",
      "release": "trixie-security",
      "version": "13.0.1-1+deb131u"
    },
    {
      "name": "prosody",
      "status": "fixed",
      "release": "bookworm",
      "version": "0.12.3-1+deb12u1"
    },
    {
      "name": "prosody",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "0.12.3-1+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 988668,
      "name": "prosody",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "0.11.9-1"
    },
    {
      "bug": 988668,
      "name": "prosody",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "0.11.9-1"
    },
    {
      "bug": 988668,
      "name": "prosody",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "0.11.9-1"
    },
    {
      "bug": 988668,
      "name": "prosody",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "0.11.9-1"
    }
  ],
  "distribution_packages": [
    {
      "name": "prosody",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "0.9.8-1",
        "0.9.9-1",
        "0.9.10-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-32921",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-32921",
      "provider_updated_at": "2025-10-24T04:50:21Z",
      "applicability_unknown": true
    },
    {
      "name": "prosody",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "0.9.12-2",
        "0.10.0-1",
        "0.10.0-1build1",
        "0.10.0-1ubuntu0.1~esm1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-32921",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-32921",
      "provider_updated_at": "2025-10-24T04:50:21Z",
      "applicability_unknown": true
    },
    {
      "name": "prosody",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "20.04",
      "versions": [
        "0.11.2-1",
        "0.11.3-1",
        "0.11.4-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-32921",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-32921",
      "provider_updated_at": "2025-10-24T04:50:21Z",
      "applicability_unknown": true
    },
    {
      "name": "prosody",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "0.11.10-1",
        "0.11.10-1build1",
        "0.11.10-1build2",
        "0.11.11-1",
        "0.11.11-2",
        "0.11.12-1",
        "0.11.13-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-32921",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-32921",
      "provider_updated_at": "2025-10-24T04:50:21Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #988668]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [prosody]Unknown
    Details (6)

    • 0.12.3-1+deb12u1 · amd64 · bookworm

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · bookworm; dsa · prosody · debian · 12

    • 0.12.3-1+deb12u1 · arm64 · bookworm

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · bookworm; dsa · prosody · debian · 12

    • 13.0.1-1~bpo12+1 · amd64 · bookworm-backports

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · bookworm; dsa · prosody · debian · 12

    • 13.0.1-1~bpo12+1 · arm64 · bookworm-backports

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · bookworm; dsa · prosody · debian · 12

    • 0.12.3-1+deb12u1 · amd64 · bookworm-security

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · bookworm; dsa · prosody · debian · 12

    • 0.12.3-1+deb12u1 · arm64 · bookworm-security

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · bookworm; dsa · prosody · debian · 12

[Debian 13 (Trixie)]

  • [prosody]Unknown
    Details (6)

    • 13.0.1-1+deb131u · amd64 · trixie

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · 13

    • 13.0.1-1+deb131u · arm64 · trixie

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · 13

    • 13.0.6-1~bpo13+1 · amd64 · trixie-backports

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · 13

    • 13.0.6-1~bpo13+1 · arm64 · trixie-backports

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · 13

    • 13.0.1-1+deb131u · amd64 · trixie-security

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · 13

    • 13.0.1-1+deb131u · arm64 · trixie-security

      Fixed · Fixed: 0.11.9-1

      dsa · prosody · debian · 13

Observed:

References

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