CVE-2026-3238

Estado: Pendiente de análisisAlta (7.5)—

A flaw was found in Samba’s WINS server component when running as an Active Directory Domain Controller. The WINS protocol handlers for certain request types did not properly validate incoming packets, allowing an unauthenticated remote attacker to trigger a NULL pointer dereference and crash the WINS service using specially crafted UDP packets.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 2.02%
Percentil entre todas las CVEs puntuadas: 80
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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access95 %
Impacto principalT1499.004 Application or System Exploitationimpact90 %

Vector CVSS AV:N/PR:N/UI:N indica explotación remota sin autenticación (T1190). NULL pointer dereference en WINS causa crash del servicio → DoS de aplicación (T1499.004).

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 Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Samba — Samba^AI

CWE

CWE-476
CWE-476

Referencias

JSON original (NVD)

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      "value": "Se encontró una vulnerabilidad en el componente de servidor WINS de Samba cuando se ejecutaba como un controlador de dominio de Active Directory. Los manejadores del protocolo WINS para ciertos tipos de solicitud no validaban correctamente los paquetes entrantes, permitiendo a un atacante remoto no autenticado activar una desreferencia de puntero NULL y provocar la caída del servicio WINS utilizando paquetes UDP especialmente diseñados."
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