CVE-2026-20049
Estado: AnalizadaAlta (7.7)—
A vulnerability in the processing of Galois/Counter Mode (GCM)-encrypted Internet Key Exchange version 2 (IKEv2) IPsec traffic of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to the allocation of an insufficiently sized block of memory. An attacker could exploit this vulnerability by sending crafted GCM-encrypted IPsec traffic to an affected device.
Leer descripción completaMostrar menos
A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition. To exploit this vulnerability, the attacker must have valid credentials to establish a VPN connection with the affected device.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- Puntuación base: 7.7
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.30%
- Percentil entre todas las CVEs puntuadas: 20
- 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 movement95 % - Impacto principal
T1499.004Application or System Exploitationimpact90 %
AV:N, PR:L requiere autenticación remota (VPN válidas). Envío de tráfico IPsec malformado causa recarga del dispositivo (DoS). CWE-131 confirma fallo de asignación de memoria.
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)
CWE
- CWE-131
Referencias
JSON original (NVD)
Mostrar
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"published": "2026-03-04T18:16:17.863",
"references": [
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"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-esp-dos-uv7yD8P5",
"tags": [
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"lang": "en",
"value": "A vulnerability in the processing of Galois/Counter Mode (GCM)-encrypted Internet Key Exchange version 2 (IKEv2) IPsec traffic of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r This vulnerability is due to the allocation of an insufficiently sized block of memory. An attacker could exploit this vulnerability by sending crafted GCM-encrypted IPsec traffic to an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition. To exploit this vulnerability, the attacker must have valid credentials to establish a VPN connection with the affected device."
},
{
"lang": "es",
"value": "Una vulnerabilidad en el procesamiento de tráfico IPsec de Intercambio de Claves de Internet versión 2 (IKEv2) cifrado con el modo Galois/Counter (GCM) del software Cisco Secure Firewall Adaptive Security Appliance (ASA) y del software Cisco Secure Firewall Threat Defense (FTD) podría permitir a un atacante remoto y autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad se debe a la asignación de un bloque de memoria de tamaño insuficiente. Un atacante podría explotar esta vulnerabilidad enviando tráfico IPsec cifrado con GCM manipulado a un dispositivo afectado. Un exploit exitoso podría permitir al atacante causar una recarga inesperada del dispositivo, lo que resultaría en una condición de DoS. Para explotar esta vulnerabilidad, el atacante debe tener credenciales válidas para establecer una conexión VPN con el dispositivo afectado."
}
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"lastModified": "2026-08-11T19:40:47.230",
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"vulnerable": true,
"matchCriteriaId": "7C131685-D69C-4460-BFFC-06DA5AD43038",
"versionEndExcluding": "7.6.4",
"versionStartIncluding": "7.6.0"
},
{
"criteria": "cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4F9E3382-B9A5-4D64-8269-83F51CF99857",
"versionEndExcluding": "7.7.10",
"versionStartIncluding": "7.7.0"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "psirt@cisco.com"
}