CVE-2026-20084
Estado: AnalizadaAlta (8.6)—
A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition.
This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition.
Leer descripción completaMostrar menos
Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.
Detalles técnicos trazas, registros y código del informe original
There are workarounds that address this vulnerability.
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: 0.35%
- Percentil entre todas las CVEs puntuadas: 27
- 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
T1190Exploit Public-Facing Applicationinitial access85 % - Impacto principal
T1499.004Application or System Exploitationimpact90 %
Ataque remoto sin autenticación (AV:N, PR:N, UI:N) a aplicación expuesta (DHCP snooping). DoS por agotamiento de recursos (CPU alta, device inaccesible).
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 (1)
CWE
- CWE-400
Referencias
JSON original (NVD)
Mostrar
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"value": "A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \r\n\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r There are workarounds that address this vulnerability."
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"value": "Una vulnerabilidad en la característica de DHCP snooping del software Cisco IOS XE podría permitir a un atacante remoto no autenticado causar que los paquetes BOOTP sean reenviados entre VLANs, resultando en una condición de denegación de servicio (DoS). Esta vulnerabilidad se debe a un manejo inadecuado de los paquetes BOOTP en los switches Cisco Catalyst de la serie 9000. Un atacante podría explotar esta vulnerabilidad enviando paquetes de solicitud BOOTP a un dispositivo afectado. Un exploit exitoso podría permitir a un atacante reenviar paquetes BOOTP de una VLAN a otra, resultando en una fuga de VLAN BOOTP y potencialmente llevando a una alta utilización de la CPU. Esto hace que el dispositivo sea inalcanzable (ya sea a través de la consola o la gestión remota) e incapaz de reenviar tráfico, resultando en una condición de DoS. Nota: Esta vulnerabilidad puede ser explotada con paquetes BOOTP unicast o broadcast. Existen soluciones alternativas que abordan esta vulnerabilidad."
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