CVE-2025-20222
Estado: AplazadaAlta (8.6)—
A vulnerability in the RADIUS proxy feature for the IPsec VPN feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
This vulnerability is due to improper processing of IPv6 packets. An attacker could exploit this vulnerability by sending IPv6 packets over an IPsec VPN connection to an affected device. A successful exploit could allow the attacker to trigger a reload of the device, resulting in a DoS condition.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Puntuación base: 8.6
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.64%
- Percentil entre todas las CVEs puntuadas: 49
- 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
T1190Exploit Public-Facing Applicationinitial access90 % - Impacto principal
T1499.004Application or System Exploitationimpact85 %
Vulnerabilidad de red remota sin autenticación (AV:N/PR:N) que causa DoS mediante envío de paquetes IPv6 malformados sobre IPsec VPN; recarga del dispositivo afectado (T1499.004: endpoint denial of service).
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-120
Referencias
JSON original (NVD)
Mostrar
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"published": "2025-08-14T17:15:36.310",
"references": [
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"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fp2k-IPsec-dos-tjwgdZCO",
"source": "psirt@cisco.com"
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"description": [
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"descriptions": [
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"lang": "en",
"value": "A vulnerability in the RADIUS proxy feature for the IPsec VPN feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper processing of IPv6 packets. An attacker could exploit this vulnerability by sending IPv6 packets over an IPsec VPN connection to an affected device. A successful exploit could allow the attacker to trigger a reload of the device, resulting in a DoS condition."
},
{
"lang": "es",
"value": "Una vulnerabilidad en la función de proxy RADIUS para la función VPN IPsec del software Cisco Secure Firewall Adaptive Security Appliance (ASA) y del software Cisco Secure Firewall Threat Defense (FTD) podría permitir que un atacante remoto no autenticado provoque una denegación de servicio (DoS). Esta vulnerabilidad se debe al procesamiento incorrecto de paquetes IPv6. Un atacante podría explotar esta vulnerabilidad enviando paquetes IPv6 a través de una conexión VPN IPsec a un dispositivo afectado. Una explotación exitosa podría permitir al atacante activar la recarga del dispositivo, lo que provocaría una denegación de servicio (DoS)."
}
],
"lastModified": "2026-06-17T08:41:07.063",
"sourceIdentifier": "psirt@cisco.com"
}