CVE-2026-20048
Estado: AplazadaAlta (7.7)—
A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to improper processing when parsing SNMP requests. An attacker could exploit this vulnerability by continuously sending SNMP queries to a specific MIB of an affected device. A successful exploit could allow the attacker to cause a kernel panic on the device, resulting in a reload and a DoS condition.
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Note: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMPv1 or SNMPv2c, the attacker must have a valid read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system.
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: 0.31%
- Percentil entre todas las CVEs puntuadas: 21
- 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
T1499.004Application or System Exploitationimpact90 %
Vulnerabilidad en SNMP de dispositivo de red (Cisco Nexus) que requiere autenticación remota (PR:L) y causa DoS mediante consultas SNMP específicas (kernel panic). CWE-789 confirma desbordamiento de memoria en procesamiento.
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)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-789
Referencias
JSON original (NVD)
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"value": "A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper processing when parsing SNMP requests. An attacker could exploit this vulnerability by continuously sending SNMP queries to a specific MIB of an affected device. A successful exploit could allow the attacker to cause a kernel panic on the device, resulting in a reload and a DoS condition.\r\nNote: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMPv1 or SNMPv2c, the attacker must have a valid read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system."
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"value": "Una vulnerabilidad en el subsistema del Protocolo Simple de Gestión de Red (SNMP) de los switches de tejido Cisco Nexus serie 9000 en modo ACI podría permitir a un atacante remoto autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado.\n\nEsta vulnerabilidad se debe a un procesamiento incorrecto al analizar solicitudes SNMP. Un atacante podría explotar esta vulnerabilidad enviando continuamente consultas SNMP a una MIB específica de un dispositivo afectado. Un exploit exitoso podría permitir al atacante causar un pánico del kernel en el dispositivo, lo que resultaría en una recarga y una condición de DoS.\nNota: Esta vulnerabilidad afecta las versiones 1, 2c y 3 de SNMP. Para explotar esta vulnerabilidad a través de SNMPv1 o SNMPv2c, el atacante debe tener una cadena de comunidad SNMP de solo lectura válida para el sistema afectado. Para explotar esta vulnerabilidad a través de SNMPv3, el atacante debe tener credenciales de usuario SNMP válidas para el sistema afectado."
}
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"lastModified": "2026-06-17T10:16:58.487",
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