{
  "cveId": "CVE-2021-21375",
  "url": "https://patchblox.com/security/cve/CVE-2021-21375",
  "summary": "CVE-2021-21375 is fixed in 13 products on 1 platform, first by libpj2 2.7.2~dfsg-1ubuntu0.1~esm1, released February 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libpjmedia-codec2: PJSIP is a free and open source multimedia communication library written in C language implementing standard based pr...",
  "description": "PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In PJSIP version 2.10 and earlier, after an initial INVITE has been sent, when two 183 responses are received, with the first one causing negotiation failure, a crash will occur. This results in a denial of service.",
  "published": "2021-03-10T15:15:00Z",
  "severity": "Medium",
  "epss": 0.0208,
  "epssPercentile": 0.81648,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libpj2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpj2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpj2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjlib-util2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjlib-util2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjlib-util2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjmedia-audiodev2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjmedia-audiodev2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjmedia-audiodev2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjmedia-codec2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjmedia-codec2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjmedia-codec2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjmedia-videodev2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjmedia-videodev2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjmedia-videodev2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjmedia2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjmedia2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjmedia2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjnath2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjnath2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjnath2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjsip-simple2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjsip-simple2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjsip-simple2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjsip-ua2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjsip-ua2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjsip-ua2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjsip2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjsip2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjsip2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjsua2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjsua2 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjsua2-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libpjsua2-2v5",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "libpjsua2-2v5 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libpjsua2-2v5-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "python-pjproject",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.7.2~dfsg-1ubuntu0.1~esm1",
      "fix": "python-pjproject 2.7.2~dfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-pjproject-2.7.2-dfsg-1ubuntu0.1-esm1",
      "released": "2026-02-11T13:16:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}