CVE-2010-4344

Estado: AnalizadaCrítica (9.8)⚠ Explotación activa💥 Exploit

Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 72%
Percentil entre todas las CVEs puntuadas: 99
Fecha de la puntuación: 7/10/2026

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).

CISA KEV — explotada activamente

Añadida al catálogo: 25/3/2022
Plazo de remediación: 15/4/2022
Uso conocido en ransomware: Unknown

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

Módulo de Metasploit (exploit fiable y al alcance de cualquiera) · Exim4 string_format Function Heap Buffer Overflow
Publicado en Exploit-DB · Exim4 < 4.69 - string_format Function Heap Buffer Overflow (Metasploit) (16/12/2010)
Publicado en Exploit-DB · Exim 4.63 - Remote Command Execution (11/12/2010)

🎯 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 principalT1059 Command and Scripting Interpreterexecution90 %
Impacto secundarioT1499.004 Application or System Exploitationimpact75 %

Desbordamiento de búfer en servicio SMTP remoto (Exim) explotable sin autenticación (AV:N/PR:N/UI:N). Permite ejecución arbitraria (C:H/I:H) y potencial DoS. Confirmado en KEV con explotación activa.

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

Privileged Account Management Filter Network Traffic Vulnerability Scanning Restrict Web-Based Content Network Segmentation Limit Software Installation

Tecnologías afectadas (4)

Canonical — Ubuntu Linux Debian — Debian Linux Exim — Exim Opensuse — Opensuse

CWE

CWE-787
CWE-787

Referencias

JSON original (NVD)

Mostrar

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      "value": "Desbordamiento de búfer basado en montículo en la función string_vformat en string.c en Exim antes de v4.70 permite a atacantes remotos ejecutar código arbitrario a través de una sesión de SMTP que incluye dos comandos MAIL junto con un mensaje de gran tamaño que contiene cabeceras modificadas, lo que lleva a un registro impropio del rechazo."
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  "lastModified": "2026-06-16T23:24:36.107",
  "cisaActionDue": "2022-04-15",
  "cisaExploitAdd": "2022-03-25",
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}