CVE-2025-5372

Estado: ModificadaAlta (8.8)—

A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 8.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.50%
Percentil entre todas las CVEs puntuadas: 41
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement60 %

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability Scanning Threat Intelligence Program Privileged Account Management Network Segmentation Disable or Remove Feature or Program Application Isolation and Sandboxing

Tecnologías afectadas (3)

Libssh — Libssh Redhat — Enterprise Linux Redhat — Openshift Container Platform

CWE

CWE-682

Referencias

JSON original (NVD)

Mostrar

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    },
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      "lang": "es",
      "value": "Se encontró una falla en las versiones de libssh compiladas con versiones de OpenSSL anteriores a la 3.0, específicamente en la función ssh_kdf(), responsable de la derivación de claves. Debido a la interpretación inconsistente de los valores de retorno, donde OpenSSL usa 0 para indicar un fallo y libssh usa 0 para éxito, la función puede devolver erróneamente un estado de éxito incluso cuando la derivación de claves falla. Esto provoca que se utilicen búferes de claves criptográficas sin inicializar en comunicaciones posteriores, lo que podría comprometer la confidencialidad, integridad y disponibilidad de las sesiones SSH."
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  "lastModified": "2026-09-01T12:17:26.550",
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