CVE-2026-20045
Estado: AnalizadaCrítica (9.8)⚠ Explotación activa
Detalles técnicos trazas, registros y código del informe original
A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root. Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 9.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 4.54%
- Percentil entre todas las CVEs puntuadas: 91
- 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).
CISA KEV — explotada activamente
- Añadida al catálogo: 21/1/2026
- Plazo de remediación: 11/2/2026
- Uso conocido en ransomware: Unknown
🎯 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 access95 % - Impacto principal
T1059Command and Scripting Interpreterexecution95 % - Impacto secundario
T1548Abuse Elevation Control Mechanismprivilege escalation85 %
Vector AV:N/AC:L/PR:N sin UI confirma explotación remota sin autenticación (T1190). CWE-94 y descripción explícita de ejecución de comandos arbitrarios + escalada a root (T1059 + T1548).
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 (3)
CWE
- CWE-94
Referencias
JSON original (NVD)
Mostrar
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"value": "A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. \r\n\r\nThis vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root. \r\nNote: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root."
},
{
"lang": "es",
"value": "Una vulnerabilidad en Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM y Presence Service (Unified CM IM&P), Cisco Unity Connection y Cisco Webex Calling Dedicated Instance podría permitir a un atacante remoto no autenticado ejecutar comandos arbitrarios en el sistema operativo subyacente de un dispositivo afectado.\n\nEsta vulnerabilidad se debe a una validación incorrecta de la entrada proporcionada por el usuario en las solicitudes HTTP. Un atacante podría explotar esta vulnerabilidad enviando una secuencia de solicitudes HTTP manipuladas a la interfaz de gestión basada en web de un dispositivo afectado. Un exploit exitoso podría permitir al atacante obtener acceso a nivel de usuario al sistema operativo subyacente y luego elevar privilegios a root.\nNota: Cisco ha asignado a este aviso de seguridad una Calificación de Impacto de Seguridad (SIR) de Crítico en lugar de Alto como indica la puntuación. La razón es que la explotación de esta vulnerabilidad podría resultar en que un atacante eleve privilegios a root."
}
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"lastModified": "2026-06-17T10:16:58.097",
"cisaActionDue": "2026-02-11",
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"cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
"cisaVulnerabilityName": "Cisco Unified Communications Products Code Injection Vulnerability"
}