cisco-sa-cucm-ssrf-cXPnHcW: Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability
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.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssrf-cXPnHcW
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Ensure WebDialer service is disabled (WebDialer is disabled by default). Since exploitation requires WebDialer to be enabled, keeping it disabled mitigates the ability to exploit this SSRF vulnerability.
Cisco Unified Communications Manager (Unified CM) / Unified CM SME WebDialer service = Enable (required for exploitation)
Event History
Frequently Asked Questions
What is the severity of cisco-sa-cucm-ssrf-cXPnHcW?
The severity of cisco-sa-cucm-ssrf-cXPnHcW is rated as critical with a score of 9.
What is the impact of cisco-sa-cucm-ssrf-cXPnHcW?
The vulnerability could allow an unauthenticated, remote attacker to conduct server-side request forgery (SSRF) attacks.
How do I fix cisco-sa-cucm-ssrf-cXPnHcW?
To mitigate cisco-sa-cucm-ssrf-cXPnHcW, it is recommended to apply the latest security patches provided by Cisco.
Which products are affected by cisco-sa-cucm-ssrf-cXPnHcW?
The affected products include Cisco Unified Communications Manager and Cisco Unified Communications Manager Session Management Edition.
When was cisco-sa-cucm-ssrf-cXPnHcW published?
The vulnerability cisco-sa-cucm-ssrf-cXPnHcW was published on June 3, 2026.