CVE-2025-20326
📋 TL;DR
This CSRF vulnerability in Cisco Unified Communications Manager allows unauthenticated remote attackers to trick authenticated users into performing unauthorized actions via malicious links. Affected systems include Cisco Unified CM and Session Management Edition software with vulnerable web interfaces.
💻 Affected Systems
- Cisco Unified Communications Manager
- Cisco Unified CM Session Management Edition
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full administrative control over Unified CM system, enabling configuration changes, service disruption, or data exfiltration.
Likely Case
Attacker modifies user settings, call routing configurations, or service parameters leading to service degradation.
If Mitigated
Limited impact due to proper CSRF protections, network segmentation, and user awareness training.
🎯 Exploit Status
Requires social engineering to trick authenticated user; no authentication bypass needed
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Cisco advisory for specific fixed versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-csrf-w762pRYd
Restart Required: No
Instructions:
1. Review Cisco advisory for affected versions 2. Download and apply appropriate patch 3. Verify patch installation 4. Test management interface functionality
🔧 Temporary Workarounds
Implement CSRF Tokens
allAdd CSRF protection tokens to web interface forms
Configuration specific to Cisco Unified CM; consult documentation
Restrict Management Interface Access
allLimit web interface access to trusted networks only
Configure firewall rules to restrict access to management IP/ports
🧯 If You Can't Patch
- Implement network segmentation to isolate management interfaces
- Enforce strict user session management and timeouts
🔍 How to Verify
Check if Vulnerable:
Check Cisco Unified CM version against advisory; test web interface for CSRF protectionsCheck Version:
show version activeVerify Fix Applied:
Verify patch version installed; test CSRF protection mechanisms📡 Detection & Monitoring
Log Indicators:
- Unexpected configuration changes
- Multiple failed authentication attempts followed by successful changes
Network Indicators:
- Unusual HTTP POST requests to management interface from unexpected sources
SIEM Query:
source="unified-cm" AND (action="config_change" OR http_method="POST") AND user_agent CONTAINS suspicious