CVE-2025-20376
📋 TL;DR
This vulnerability allows authenticated administrators in Cisco Unified CCX to upload and execute arbitrary files via the web UI, leading to remote code execution with root privileges. It affects organizations using vulnerable versions of Cisco Unified CCX. Attackers need valid administrative credentials to exploit this flaw.
💻 Affected Systems
- Cisco Unified Contact Center Express (Unified CCX)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with administrative credentials gains full root access to the underlying system, enabling complete compromise of the Cisco Unified CCX server, data theft, and lateral movement within the network.
Likely Case
Malicious insiders or compromised admin accounts upload and execute malware, leading to persistent backdoors, data exfiltration, or disruption of contact center operations.
If Mitigated
With proper access controls and monitoring, exploitation would be limited to authorized administrators, reducing risk to trusted personnel scenarios.
🎯 Exploit Status
Exploitation requires admin credentials but is straightforward once authenticated; file upload and execution mechanisms are typically easy to abuse.
🛠️ 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-cc-mult-vuln-gK4TFXSn
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download and apply the recommended patch from Cisco. 3. Restart the Unified CCX system as required. 4. Verify the patch is applied successfully.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit administrative web UI access to trusted IP addresses and users only.
Configure firewall rules to restrict access to Cisco Unified CCX admin interface (e.g., iptables or network ACLs).
Disable Unnecessary File Uploads
allIf possible, disable file upload functionality in the web UI that is not essential for operations.
Check Cisco documentation for configuration options to restrict file upload features.
🧯 If You Can't Patch
- Implement strict access controls to limit admin interface exposure to only necessary personnel and networks.
- Monitor logs for unusual file upload activities and admin account usage.
🔍 How to Verify
Check if Vulnerable:
Check the Cisco Unified CCX version against the affected versions listed in the Cisco advisory.Check Version:
Check via Cisco Unified CCX web UI or CLI; specific command varies by version (e.g., 'show version' in CLI or admin interface).Verify Fix Applied:
Verify the system version matches or exceeds the patched version specified in the advisory after applying updates.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads in web UI logs
- Execution of unexpected processes or commands from web UI sessions
- Admin account logins from unusual IP addresses
Network Indicators:
- HTTP POST requests with file uploads to admin endpoints
- Outbound connections from Cisco Unified CCX to unknown external IPs post-upload
SIEM Query:
Example: search for 'file upload' events in Cisco Unified CCX logs combined with admin user activity.