CVE-2025-20191
Estado: AplazadaAlta (7.4)—
A vulnerability in the Switch Integrated Security Features (SISF) of Cisco IOS Software, Cisco IOS XE Software, Cisco NX-OS Software, and Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to the incorrect handling of DHCPv6 packets. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Puntuación base: 7.4
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.25%
- Percentil entre todas las CVEs puntuadas: 14
- Fecha de la puntuación: 5/10/2026
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
T1499Endpoint Denial of Serviceimpact90 %
AV:A (red adyacente), sin autenticación, requiere paquete DHCPv6 crafted que causa recarga del dispositivo (DoS). T1210 por red adyacente; T1499 por negación de servicio explícita.
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 (4)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-805
Referencias
JSON original (NVD)
Mostrar
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"published": "2025-05-07T18:15:39.110",
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sisf-dos-ZGwt4DdY",
"source": "psirt@cisco.com"
}
],
"vulnStatus": "Deferred",
"weaknesses": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"description": [
{
"lang": "en",
"value": "CWE-805"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the Switch Integrated Security Features (SISF) of Cisco IOS Software, Cisco IOS XE Software, Cisco NX-OS Software, and Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to the incorrect handling of DHCPv6 packets. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition."
},
{
"lang": "es",
"value": "Una vulnerabilidad en las Funciones de Seguridad Integradas del Switch (SISF) de Cisco IOS Software, Cisco IOS XE Software, Cisco NX-OS Software y Cisco Wireless LAN Controller (WLC) AireOS Software podría permitir que un atacante adyacente no autenticado provoque una denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad se debe al manejo incorrecto de paquetes DHCPv6. Un atacante podría explotar esta vulnerabilidad enviando un paquete DHCPv6 manipulado a un dispositivo afectado. Si se explota con éxito, el atacante podría provocar la recarga del dispositivo, lo que provocaría una denegación de servicio (DoS)."
}
],
"lastModified": "2026-06-17T08:41:01.520",
"sourceIdentifier": "psirt@cisco.com"
}