CVE-2025-8034

Estado: ModificadaAlta (8.8)—

Memory safety bugs present in Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird ESR 128.12, Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

CVSS

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

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.40%
Percentil entre todas las CVEs puntuadas: 32
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1203 Exploitation for Client Executionexecution95 %
Impacto principalT1059 Command and Scripting Interpreterexecution85 %

Vector CVSS con UI:R (interacción del usuario requerida) y descripción de memory safety bugs en navegador/correo que podrían ejecutar código arbitrario tras abrir contenido malicioso.

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

Restrict Web-Based Content Privileged Account Management Limit Software Installation Execution Prevention Behavior Prevention on Endpoint Disable or Remove Feature or Program

Tecnologías afectadas (2)

Mozilla — Firefox Mozilla — Thunderbird

CWE

CWE-119

Referencias

JSON original (NVD)

Mostrar

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      "source": "security@mozilla.org"
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      "value": "Errores de seguridad de memoria presentes en Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird ESR 128.12, Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 y Thunderbird 140. Algunos de estos errores mostraron evidencia de corrupción de memoria y presumimos que, con suficiente esfuerzo, algunos de ellos podrían haberse explotado para ejecutar código arbitrario. Esta vulnerabilidad afecta a Firefox menor que 141, Firefox ESR menor que 115.26, Firefox ESR menor que 128.13, Firefox ESR menor que 140.1, Thunderbird menor que 141, Thunderbird menor que 128.13 y Thunderbird menor que 140.1."
    }
  ],
  "lastModified": "2026-10-05T15:10:00.590",
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