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CVE-2025-57767

Estado: AnalizadaAlta (7.5)—

Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.15.2, 21.10.2, and 22.5.2, if a SIP request is received with an Authorization header that contains a realm that wasn't in a previous 401 response's WWW-Authenticate header, or an Authorization header with an incorrect realm was received without a previous 401 response being sent, the get_authorization_header() function in res_pjsip_authenticator_digest will return a NULL. This wasn't being checked before attempting to get the digest algorithm from the header which causes a SEGV. This issue has been patched in versions 20.15.2, 21.10.2, and 22.5.2. There are no workarounds.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vector CVSS de red sin autenticación (AV:N/PR:N) indica explotación remota. CWE-253 describe falta de validación de entrada (realm en Authorization). El SEGV causa denegación de servicio (A:H en CVSS). No requiere interacción ni privilegios previos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Sangoma — Asterisk

CWE

Referencias

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{
  "id": "CVE-2025-57767",
  "cveTags": [],
  "metrics": {
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          "id": "CVE-2025-57767",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-08-28T17:12:27.086945Z"
        }
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          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
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  "published": "2025-08-28T16:15:35.410",
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      "description": [
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          "value": "CWE-253"
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      "lang": "en",
      "value": "Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.15.2, 21.10.2, and 22.5.2, if a SIP request is received with an Authorization header that contains a realm that wasn't in a previous 401 response's WWW-Authenticate header, or an Authorization header with an incorrect realm was received without a previous 401 response being sent, the get_authorization_header() function in res_pjsip_authenticator_digest will return a NULL. This wasn't being checked before attempting to get the digest algorithm from the header which causes a SEGV. This issue has been patched in versions 20.15.2, 21.10.2, and 22.5.2. There are no workarounds."
    },
    {
      "lang": "es",
      "value": "Asterisk es una centralita privada y un kit de herramientas de telefonía de código abierto. Antes de las versiones 20.15.2, 21.10.2 y 22.5.2, si se recibe una solicitud SIP con una cabecera de autorización que contiene un *realm* que no estaba en la cabecera WWW-Authenticate de una respuesta 401 anterior, o si se recibe una cabecera de autorización con un *realm* incorrecto sin que se haya enviado una respuesta 401 anterior, la función 'get_authorization_header()' en 'res_pjsip_authenticator_digest' devolverá un valor NULL. Esto no se estaba verificando antes de intentar obtener el algoritmo de *digest* de la cabecera, lo que provoca un SEGV. Este problema ha sido parcheado en las versiones 20.15.2, 21.10.2 y 22.5.2. No hay soluciones alternativas."
    }
  ],
  "lastModified": "2026-06-17T09:43:23.770",
  "configurations": [
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