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Privilege Escalation Vulnerability in Cisco Unified Communications Manager

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: CRITICAL

Software Affected

Cisco Unified Communications Manager and Cisco Unified Communications Manager SME Release 14 prior to 14SU6

Cisco Unified Communications Manager and Cisco Unified Communications Manager SME Release 15 prior to 15SU5 (Sep 2026) or COP

Note: Vulnerability is only exploitable on systems with WebDialer service enabled (disabled by default)

Overview

A vulnerability has been reported in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) that could allow an unauthenticated, remote attacker to conduct Server-Side Request Forgery (SSRF) attacks and potentially gain root-level privileges on the affected system.

Target Audience:

All IT administrators, network administrators, VoIP administrators, and individuals responsible for maintaining Cisco Unified Communications infrastructure.

Risk Assessment:

Critical risk of unauthenticated remote exploitation leading to privilege escalation.

Impact Assessment:

Potential for unauthorised root privilege access.

Description

Cisco Unified Communications Manager (Unified CM) is a centralized enterprise communications platform that provides call control and management for voice, video, messaging, mobility, and conferencing services.

The vulnerability exists due to improper input validation for specific HTTP requests in affected products. An attacker could exploit this vulnerability by sending a specially crafted HTTP request to an affected device.

Successful exploitation could allow an unauthenticated, remote attacker to conduct Server-Side Request Forgery (SSRF) attacks and potentially gain root-level privileges on the affected system.

Note: It has been reported that this vulnerability is actively being exploited.

Solution

Apply appropriate security updates/workarounds as mentioned in the Cisco advisory:

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssrf-cXPnHcW

Vendor Information

Cisco

https://sec.cloudapps.cisco.com/security/center/publicationListing.x

References

 

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssrf-cXPnHcW

CVE Name

CVE-2026-20230

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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