{
  "cveId": "CVE-2021-46837",
  "url": "https://patchblox.com/security/cve/CVE-2021-46837",
  "summary": "CVE-2021-46837 is fixed in asterisk on 1 platform by DEBIAN-CVE-2021-46837 (version 1:18.9.0~dfsg\u002B~cs6.10.40431411-1), released August 30, 2022. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "asterisk: res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Aste...",
  "description": "res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.",
  "published": "2022-08-30T07:15:07Z",
  "severity": "medium",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0467,
  "epssPercentile": 0.91823,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "asterisk",
      "release": "Debian 14",
      "fixedVersion": "1:18.9.0~dfsg\u002B~cs6.10.40431411-1",
      "fix": "DEBIAN-CVE-2021-46837",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-46837",
      "released": "2022-08-30T07:15:07Z"
    }
  ],
  "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"
  }
}