Description
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 breakdown
Affected products
- Cisco / Cisco Unified Communications Manager15SU4a – 15SU4a
- Cisco / Cisco Unified Communications Manager15SU4 – 15SU4
- Cisco / Cisco Unified Communications ManagerN/A – N/A
- Cisco / Cisco Unified Communications Manager14 – 14
- Cisco / Cisco Unified Communications Manager14SU1 – 14SU1
- Cisco / Cisco Unified Communications Manager14SU2 – 14SU2
- Cisco / Cisco Unified Communications Manager14SU3 – 14SU3
- Cisco / Cisco Unified Communications Manager15 – 15
- Cisco / Cisco Unified Communications Manager15SU1 – 15SU1
- Cisco / Cisco Unified Communications Manager14SU4 – 14SU4
- Cisco / Cisco Unified Communications Manager14SU4a – 14SU4a
- Cisco / Cisco Unified Communications Manager15SU1a – 15SU1a
- Cisco / Cisco Unified Communications Manager15SU2 – 15SU2
- Cisco / Cisco Unified Communications Manager15.0.1.13010-1 – 15.0.1.13010-1
- Cisco / Cisco Unified Communications Manager15.0.1.13011-1 – 15.0.1.13011-1
- Cisco / Cisco Unified Communications Manager15.0.1.13012-1 – 15.0.1.13012-1
- Cisco / Cisco Unified Communications Manager15.0.1.13013-1 – 15.0.1.13013-1
- Cisco / Cisco Unified Communications Manager15.0.1.13014-1 – 15.0.1.13014-1
- Cisco / Cisco Unified Communications Manager15.0.1.13015-1 – 15.0.1.13015-1
- Cisco / Cisco Unified Communications Manager15.0.1.13016-1 – 15.0.1.13016-1
- Cisco / Cisco Unified Communications Manager15.0.1.13017-1 – 15.0.1.13017-1
- Cisco / Cisco Unified Communications Manager15SU3a – 15SU3a
- Cisco / Cisco Unified Communications Manager14SU5 – 14SU5
- Cisco / unified_communications_manager14.0 – 14su6
- Cisco / unified_communications_manager14.0 – 14su6
News coverage
- Cisco Unified CM Flaw Exploited After PoC Reveals File-Write Path to RootThe Hacker News · 6/24/2026