CVE-2026-20230highbajo ataqueCWE-918

CVE-2026-20230: fallo de gravedad alta en Cisco Unified Communications Manager

Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability

Publicada el · Actualizada el

93Vexday Risk Score

Prioriza la corrección. Ella está bajo explotación confirmada por CISA y tiene prueba de concepto pública.

ssvc Actcvss 8.6epss 88%
de la publicación al arma2 días
Publicada en NVD3 jun
1ª PoC+2d
CISA KEV+22d
probabilidad de explotación
88%top 1% de las CVE
explotación observada
síCISA + VulnCheck
5 exploit(s) público(s)
Acción exigida por CISAplazo federal: 2026-06-28

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

En resumen

Una falla en Cisco Unified Communications Manager permite que atacantes envíen solicitudes especialmente elaboradas para engañar al servidor y acceder a recursos internos, escribiendo archivos en el sistema. Esto podría permitir que un atacante obtenga control total (acceso root) del dispositivo afectado.

Detalle técnico

Vulnerabilidad SSRF en Cisco Unified CM y Unified CM SME debido a validación inadecuada de entrada HTTP. Un atacante remoto no autenticado puede enviar solicitudes HTTP manipuladas a través del servicio WebDialer (cuando está habilitado) para escribir archivos en el sistema operativo subyacente, habilitando escalada de privilegios hasta root. El ataque requiere WebDialer activo pero no necesita autenticación.

Resumen generado y traducido por IA a partir de la descripción oficial.
A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct server-side request forgery (SSRF) attacks through an affected device. This vulnerability is due to improper input validation for specific HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to write files to the underlying operating system that could be used later to elevate 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. Note: To exploit this vulnerability, the WebDialer service must be enabled. WebDialer is disabled by default.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Productos afectados
Cisco · Cisco Unified Communications Manager
PoCs públicas encontradas — 5
githubgithub.com/HORKimhab/CVE-2026-20230★ 1githubgithub.com/W5M1n9/Cisco-Unified-Communications-Manager-Server-Side-Forgery-Request-Vulnerability-CVE-2026-20230★ 1githubgithub.com/HalilDeniz/CVE-2026-20230-Scanner★ 0cve_referencedenizhalil.com/2026/06/12/cve-2026-20230-cisco-unified-cm-ssrf/no verificadovulncheckvulncheck.com/xdb/0bab51e2df38no verificado
⚠ Recursos públicos, para evaluar la exposición de sistemas que controlas o estás autorizado a probar. Prueba solo con autorización.
CVEs relacionadas — Cisco Unified Communications Manager

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Referencias
https://denizhalil.com/2026/06/12/cve-2026-20230-cisco-unified-cm-ssrf/https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssrf-cXPnHcWhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20230