CVE-2025-20361
📋 TL;DR
An authenticated cross-site scripting (XSS) vulnerability in Cisco Unified Communications Manager web interface allows attackers with administrative credentials to inject malicious scripts. This could lead to session hijacking, data theft, or unauthorized actions within the management interface. Only systems running vulnerable versions of Cisco Unified CM and Unified CM SME are affected.
💻 Affected Systems
- Cisco Unified Communications Manager
- Cisco Unified Communications Manager Session Management Edition
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full administrative control, steals sensitive configuration data, deploys backdoors, or disrupts entire communications infrastructure.
Likely Case
Attacker steals session cookies to impersonate administrators, modifies configuration settings, or extracts sensitive information from the management interface.
If Mitigated
Limited impact due to proper input validation, network segmentation, and strong credential management preventing exploitation.
🎯 Exploit Status
Exploitation requires valid admin credentials and ability to inject malicious scripts into specific web pages.
🛠️ 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-stored-xss-Fnj66YLy
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download and apply appropriate patch from Cisco. 3. Restart affected services. 4. Verify fix implementation.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation and output encoding for web interface fields
Access Restriction
allRestrict web management interface access to trusted IP addresses only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate management interface
- Enforce strong credential policies and multi-factor authentication for admin accounts
🔍 How to Verify
Check if Vulnerable:
Check current version against affected versions in Cisco advisoryCheck Version:
From CLI: show version activeVerify Fix Applied:
Verify installed version matches or exceeds fixed version in advisory📡 Detection & Monitoring
Log Indicators:
- Unusual admin login patterns
- Suspicious input patterns in web logs
- Multiple failed login attempts followed by successful login
Network Indicators:
- Unusual HTTP requests to management interface
- Script injection patterns in network traffic
SIEM Query:
Search for web logs containing suspicious script tags or encoded payloads targeting Cisco UC management pages