CVE-2025-20375
📋 TL;DR
This vulnerability allows authenticated administrators on Cisco Unified CCX systems to upload and execute arbitrary files through the web UI, potentially gaining full system access. It affects Cisco Unified CCX systems with vulnerable versions. 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
Full system compromise allowing attacker to execute arbitrary code, install persistent backdoors, steal sensitive data, and pivot to other network systems.
Likely Case
Privileged attacker uploads malicious scripts to gain shell access, potentially disrupting call center operations or exfiltrating customer data.
If Mitigated
With proper access controls and monitoring, exploitation would be detected quickly and contained to isolated systems.
🎯 Exploit Status
Exploitation requires admin credentials but is technically simple once authenticated; file upload functionality is abused.
🛠️ 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 appropriate patch from Cisco. 3. Restart the Unified CCX system. 4. Verify patch installation through version check.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit administrative access to only trusted users and networks using firewall rules and access controls.
Disable Unnecessary File Uploads
allIf possible, disable file upload functionality in web UI through configuration changes.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Unified CCX systems from critical infrastructure
- Enhance monitoring of file upload activities and admin account usage with immediate alerting
🔍 How to Verify
Check if Vulnerable:
Check Cisco Unified CCX version against affected versions listed in Cisco advisory.Check Version:
Check via Cisco Unified CCX web UI under Administration > System > Software Version or via CLI: show versionVerify Fix Applied:
Verify installed version matches or exceeds patched version from Cisco advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads via web UI
- Admin account logins from unexpected locations/times
- Execution of unexpected processes or scripts
Network Indicators:
- HTTP POST requests with file uploads to CCX web UI endpoints
- Outbound connections from CCX system to unknown destinations
SIEM Query:
source="cisco-ccx" AND (event_type="file_upload" OR user="admin") AND file_extension IN ("exe", "sh", "bat", "py")