{
  "id": "CVE-2021-46837",
  "sourceIdentifier": "cve@mitre.org",
  "published": "2022-08-30T07:15:07.417",
  "lastModified": "2023-01-28T01:20:40.947",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n res_pjsip_t38 en Sangoma Asterisk versiones 16.x anteriores a 16.16.2, 17.x anteriores a 17.9.3, y 18.x anteriores a 18.2.2, y Certified Asterisk anteriores a 16.8-cert7, permite a un atacante desencadenar un fallo mediante el env\u00edo de una l\u00ednea m=image y un puerto cero en una respuesta a una Re invitaci\u00f3n T.38 iniciada por Asterisk. Se trata de una reaparici\u00f3n de los s\u00edntomas de la CVE-2019-15297 pero no exactamente por el mismo motivo. El fallo es producido porque se presenta una operaci\u00f3n de append relativa a la topolog\u00eda activa, pero deber\u00eda ser en cambio una operaci\u00f3n de replace"
    }
  ],
  "metrics": {
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        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      }
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  "weaknesses": [
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      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
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          "lang": "en",
          "value": "CWE-476"
        }
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    }
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  "references": [
    {
      "url": "https://downloads.asterisk.org/pub/security/AST-2021-006.html",
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html",
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
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    {
      "url": "https://www.debian.org/security/2022/dsa-5285",
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
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    }
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}