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CVE-2026-27651

Estado: ModificadaAlta (8.7)—

When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

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:4.0/AV:N/AC:L/PR:N/UI:N indica acceso remoto sin privilegios. CWE-476 (null pointer dereference) causa terminación de procesos worker en NGINX. El impacto es negación de servicio.

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

Tecnologías afectadas (2)

CWE

Referencias

JSON original (NVD)

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  "published": "2026-03-24T15:16:32.910",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "f5sirt@f5.com",
      "description": [
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          "lang": "en",
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      "lang": "en",
      "value": "When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
    },
    {
      "lang": "es",
      "value": "Cuando el módulo ngx_mail_auth_http_module está habilitado en NGINX Plus o NGINX Open Source, las solicitudes no reveladas pueden causar la terminación de los procesos de trabajador. Este problema puede ocurrir cuando (1) la autenticación CRAM-MD5 o APOP está habilitada, y (2) el servidor de autenticación permite reintentar al devolver el encabezado de respuesta Auth-Wait. Nota: Las versiones de software que han alcanzado el Fin del Soporte Técnico (EoTS) no son evaluadas."
    }
  ],
  "lastModified": "2026-07-15T02:19:09.153",
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