CVE-2025-20251
Estado: AplazadaAlta (8.5)—
A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to create or delete arbitrary files on the underlying operating system. If critical system files are manipulated, new Remote Access SSL VPN sessions could be denied and existing sessions could be dropped, causing a denial of service (DoS) condition. An exploited device requires a manual reboot to recover.
This vulnerability is due to insufficient input validation when processing HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device.
Leer descripción completaMostrar menos
A successful exploit could allow the attacker to create or delete files on the underlying operating system, which could cause the Remote Access SSL VPN service to become unresponsive. To exploit this vulnerability, the attacker must be authenticated as a VPN user of the affected device.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
- Puntuación base: 8.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.47%
- Percentil entre todas las CVEs puntuadas: 38
- 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.
- Explotación
T1210Exploitation of Remote Serviceslateral movement85 % - Impacto principal
T1565.002Transmitted Data Manipulationimpact90 % - Impacto secundario
T1499.004Application or System Exploitationimpact85 %
Acceso remoto autenticado a servicio VPN (T1210). Impacto: manipulación de archivos críticos del SO (T1565.002) y denegación de servicio por eliminación de archivos del servicio VPN (T1499.004). Vector CVSS con PR:L confirma autenticación requerida.
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)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-1287
Referencias
JSON original (NVD)
Mostrar
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"status": "affected",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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{
"status": "affected",
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"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
"version": "7.2.7"
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{
"status": "affected",
"version": "7.2.5.2"
},
{
"status": "affected",
"version": "7.3.1.2"
},
{
"status": "affected",
"version": "7.2.8"
},
{
"status": "affected",
"version": "7.6.0"
},
{
"status": "affected",
"version": "7.4.2"
},
{
"status": "affected",
"version": "7.2.8.1"
},
{
"status": "affected",
"version": "7.0.6.3"
},
{
"status": "affected",
"version": "7.4.2.1"
},
{
"status": "affected",
"version": "7.2.9"
},
{
"status": "affected",
"version": "7.0.7"
},
{
"status": "affected",
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{
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}
],
"defaultStatus": "unknown"
}
]
}
],
"published": "2025-08-14T17:15:38.547",
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-http-file-hUyX2jL4",
"source": "psirt@cisco.com"
}
],
"vulnStatus": "Deferred",
"weaknesses": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"description": [
{
"lang": "en",
"value": "CWE-1287"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to create or delete arbitrary files on the underlying operating system. If critical system files are manipulated, new Remote Access SSL VPN sessions could be denied and existing sessions could be dropped, causing a denial of service (DoS) condition. An exploited device requires a manual reboot to recover.\r\n\r\nThis vulnerability is due to insufficient input validation when processing HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to create or delete files on the underlying operating system, which could cause the Remote Access SSL VPN service to become unresponsive.\r\nTo exploit this vulnerability, the attacker must be authenticated as a VPN user of the affected device."
},
{
"lang": "es",
"value": "Una vulnerabilidad en el servicio VPN SSL de acceso remoto para el software Cisco Secure Firewall Adaptive Security Appliance (ASA) y el software Cisco Secure Firewall Threat Defense (FTD) podría permitir que un atacante remoto autenticado cree o elimine archivos arbitrarios en el sistema operativo subyacente. Si se manipulan archivos críticos del sistema, se podrían denegar nuevas sesiones VPN SSL de acceso remoto y descartar las existentes, lo que causa una denegación de servicio (DoS). Un dispositivo vulnerable requiere un reinicio manual para recuperarse. Esta vulnerabilidad se debe a una validación de entrada insuficiente al procesar solicitudes HTTP. Un atacante podría explotar esta vulnerabilidad enviando solicitudes HTTP manipuladas a un dispositivo afectado. Una explotación exitosa podría permitir al atacante crear o eliminar archivos en el sistema operativo subyacente, lo que podría provocar que el servicio VPN SSL de acceso remoto deje de responder. Para explotar esta vulnerabilidad, el atacante debe estar autenticado como usuario VPN del dispositivo afectado."
}
],
"lastModified": "2026-06-17T08:41:11.553",
"sourceIdentifier": "psirt@cisco.com"
}