{
  "cveId": "CVE-2021-3639",
  "url": "https://patchblox.com/security/cve/CVE-2021-3639",
  "summary": "CVE-2021-3639 is fixed in 3 products on 1 platform, first by libapache2-mod-auth-mellon 0.13.1-1ubuntu0.3, released August 3, 2021. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libapache2-mod-auth-mellon: A flaw was found in mod_auth_mellon where it does not sanitize logout URLsproperly",
  "description": "A flaw was found in mod_auth_mellon where it does not sanitize logout URLsproperly. This issue could be used by an attacker to facilitate phishingattacks by tricking users into visiting a trusted web application URL thatredirects to an external and potentially malicious server. The highestthreat from this liability is to confidentiality and integrity.",
  "published": "2021-08-03T17:00:00Z",
  "severity": "Medium",
  "cvss": 6.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "epss": 0.01061,
  "epssPercentile": 0.64809,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libapache2-mod-auth-mellon",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "0.18.0-1",
      "fix": "DEBIAN-CVE-2021-3639",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3639",
      "released": "2022-08-22T15:15:13Z"
    },
    {
      "platform": "linux",
      "product": "libapache2-mod-auth-mellon",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "0.18.0-1",
      "fix": "DEBIAN-CVE-2021-3639",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3639",
      "released": "2022-08-22T15:15:13Z"
    },
    {
      "platform": "linux",
      "product": "libapache2-mod-auth-mellon",
      "release": "Debian 14",
      "fixedVersion": "0.18.0-1",
      "fix": "DEBIAN-CVE-2021-3639",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3639",
      "released": "2022-08-22T15:15:13Z"
    },
    {
      "platform": "linux",
      "product": "libapache2-mod-auth-mellon",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.13.1-1ubuntu0.3",
      "fix": "libapache2-mod-auth-mellon 0.13.1-1ubuntu0.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libapache2-mod-auth-mellon-0.13.1-1ubuntu0.3",
      "released": "2021-08-03T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libapache2-mod-auth-mellon",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "0.16.0-1ubuntu0.1",
      "fix": "libapache2-mod-auth-mellon 0.16.0-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libapache2-mod-auth-mellon-0.16.0-1ubuntu0.1",
      "released": "2021-08-03T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libapache2-mod-auth-mellon",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "0.17.0-1ubuntu1",
      "fix": "libapache2-mod-auth-mellon 0.17.0-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libapache2-mod-auth-mellon-0.17.0-1ubuntu1",
      "released": "2021-08-03T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libapache2-mod-auth-mellon",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "0.17.0-1ubuntu1",
      "fix": "libapache2-mod-auth-mellon 0.17.0-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-libapache2-mod-auth-mellon-0.17.0-1ubuntu1",
      "released": "2026-01-16T01:42:22Z"
    },
    {
      "platform": "linux",
      "product": "libapache2-mod-auth-mellon",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "0.17.0-1ubuntu1",
      "fix": "libapache2-mod-auth-mellon 0.17.0-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libapache2-mod-auth-mellon-0.17.0-1ubuntu1",
      "released": "2026-01-16T01:42:24Z"
    },
    {
      "platform": "linux",
      "product": "mod_auth_mellon",
      "release": "RHEL 8",
      "fixedVersion": "0:0.14.0-12.el8.1",
      "fix": "RHSA-2022:1934",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2022-1934",
      "released": "2022-05-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_auth_mellon",
      "release": "almalinux 8",
      "fixedVersion": "0.14.0-12.el8.1",
      "fix": "ALSA-2022:1934",
      "url": "https://patchblox.com/security/fix/linux/alsa-2022-1934",
      "released": "2022-05-10T08:08:25Z"
    },
    {
      "platform": "linux",
      "product": "mod_auth_mellon",
      "release": "ol 8",
      "fixedVersion": "0:0.14.0-12.el8.1",
      "fix": "ELSA-2022-1934",
      "url": "https://patchblox.com/security/fix/linux/elsa-2022-1934",
      "released": "2022-05-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_auth_mellon",
      "release": "rocky 8",
      "fixedVersion": "0:0.14.0-12.el8.1",
      "fix": "RLSA-2022:1934",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2022-1934",
      "released": "2022-05-10T08:08:25Z"
    },
    {
      "platform": "linux",
      "product": "mod_auth_mellon-diagnostics",
      "release": "RHEL 8",
      "fixedVersion": "0:0.14.0-12.el8.1",
      "fix": "RHSA-2022:1934",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2022-1934",
      "released": "2022-05-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "mod_auth_mellon-diagnostics",
      "release": "almalinux 8",
      "fixedVersion": "0.14.0-12.el8.1",
      "fix": "ALSA-2022:1934",
      "url": "https://patchblox.com/security/fix/linux/alsa-2022-1934",
      "released": "2022-05-10T08:08:25Z"
    },
    {
      "platform": "linux",
      "product": "mod_auth_mellon-diagnostics",
      "release": "ol 8",
      "fixedVersion": "0:0.14.0-12.el8.1",
      "fix": "ELSA-2022-1934",
      "url": "https://patchblox.com/security/fix/linux/elsa-2022-1934",
      "released": "2022-05-17T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}