CVE-2025-20287
📋 TL;DR
This vulnerability allows authenticated attackers with Config Managers credentials to upload arbitrary files to Cisco EPNM systems via the web management interface. It affects Cisco Evolved Programmable Network Manager installations where the web interface is accessible. Attackers can potentially upload malicious files that could lead to further system compromise.
💻 Affected Systems
- Cisco Evolved Programmable Network Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could upload webshells or malicious scripts, gain persistent access, execute arbitrary code, and potentially compromise the entire network management system.
Likely Case
Attackers with valid credentials could upload configuration files or scripts to modify system behavior, disrupt network management operations, or establish footholds for lateral movement.
If Mitigated
With proper access controls and network segmentation, impact would be limited to the EPNM system itself without affecting managed network devices.
🎯 Exploit Status
Requires authentication and knowledge of specific API endpoint
🛠️ 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-epni-arb-file-upload-jjdM2P83
Restart Required: No
Instructions:
1. Access Cisco Software Download Center 2. Download latest EPNM release 3. Follow Cisco EPNM upgrade documentation 4. Apply patch via web interface or CLI
🔧 Temporary Workarounds
Restrict Web Interface Access
allLimit access to EPNM web interface to trusted IP addresses only
Configure firewall rules to restrict access to EPNM management IP/ports
Strengthen Authentication
allImplement multi-factor authentication and strong password policies for Config Managers accounts
Configure TACACS+/RADIUS with MFA for EPNM authentication
🧯 If You Can't Patch
- Implement strict network segmentation to isolate EPNM management interface
- Monitor and audit all file upload activities through the web interface
🔍 How to Verify
Check if Vulnerable:
Check EPNM version via web interface (Admin > System > About) or CLI 'show version' commandCheck Version:
show versionVerify Fix Applied:
Verify installed version matches or exceeds fixed version listed in Cisco advisory📡 Detection & Monitoring
Log Indicators:
- Unusual file upload patterns via web interface
- Multiple failed upload attempts followed by successful upload
- Uploads to non-standard directories
Network Indicators:
- HTTP POST requests to file upload API endpoints
- Unusual traffic patterns to EPNM management interface
SIEM Query:
source="epnm_logs" AND (event_type="file_upload" AND file_extension IN ("php", "jsp", "asp", "exe", "sh"))