« Volver al listado

CVE-2021-46837

Estado: ModificadaMedia (6.5)—

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (3)

Asterisk — Certified AsteriskDebian — Debian LinuxDigium — Asterisk

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-46837",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-08-30T07:15:07.417",
  "references": [
    {
      "url": "https://downloads.asterisk.org/pub/security/AST-2021-006.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.debian.org/security/2022/dsa-5285",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://downloads.asterisk.org/pub/security/AST-2021-006.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.debian.org/security/2022/dsa-5285",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "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 función 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 envío de una línea m=image y un puerto cero en una respuesta a una Re invitación T.38 iniciada por Asterisk. Se trata de una reaparición de los síntomas de la CVE-2019-15297 pero no exactamente por el mismo motivo. El fallo es producido porque se presenta una operación de append relativa a la topología activa, pero debería ser en cambio una operación de replace"
    }
  ],
  "lastModified": "2026-06-17T04:15:38.630",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:asterisk:certified_asterisk:16.8.0:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "335EF1B5-AD89-48E2-AB2C-BF376BC36F77"
            },
            {
              "criteria": "cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E64BCD44-2298-4710-9CC3-DF82E6A8DF94"
            },
            {
              "criteria": "cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A35C117A-6EFB-42EB-AD2A-EA7866606927"
            },
            {
              "criteria": "cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "40003CBE-792F-4875-9E60-6F1CE0BBAA8E"
            },
            {
              "criteria": "cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "46A7AA7B-13F2-496A-99ED-1CC13234E8CB"
            },
            {
              "criteria": "cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "147663CB-B48D-4D89-96BF-F92FF96F347F"
            },
            {
              "criteria": "cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "27DBBC83-930A-4ECE-8C1E-47481D881B0D"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E6D5A9E8-239F-492C-95AD-7CF2AB964D87",
              "versionEndExcluding": "16.16.2",
              "versionStartIncluding": "16.0.0"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9CA36883-D695-47A1-8CA7-2F128BFA194D",
              "versionEndExcluding": "17.9.3",
              "versionStartIncluding": "17.0.0"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8DEE180D-A041-42AB-AE5E-DDBD9CF0AACF",
              "versionEndExcluding": "18.2.2",
              "versionStartIncluding": "18.0.0"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}