CVE-2025-20213
📋 TL;DR
This vulnerability allows authenticated local attackers with read-only CLI access to overwrite arbitrary files on Cisco Catalyst SD-WAN Manager devices. By exploiting improper file access controls, attackers can gain root privileges. Organizations using affected Cisco SD-WAN vManage/Catalyst SD-WAN Manager versions are at risk.
💻 Affected Systems
- Cisco Catalyst SD-WAN Manager
- Cisco SD-WAN vManage
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains root privileges, completely compromises the SD-WAN management system, and could pivot to other network segments or disrupt SD-WAN operations.
Likely Case
Privilege escalation from low-privilege user to root, allowing configuration changes, data exfiltration, or service disruption.
If Mitigated
Limited to read-only operations if proper access controls prevent file overwrites, but still represents a security control bypass.
🎯 Exploit Status
Exploitation requires local CLI access with read-only credentials and knowledge of crafted commands.
🛠️ 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-sdwan-fileoverwrite-Uc9tXWH
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download and apply the appropriate patch from Cisco. 3. Restart the affected device as required. 4. Verify the fix using version checks.
🔧 Temporary Workarounds
Restrict CLI Access
allLimit CLI access to only necessary administrative users; remove or restrict read-only CLI accounts.
# Review and modify user access controls via CLI or web interface
Implement Least Privilege
allEnsure users have only the minimum necessary privileges; avoid read-only CLI accounts if possible.
# Configure role-based access control to restrict file system operations
🧯 If You Can't Patch
- Isolate affected systems from untrusted networks and limit access to trusted administrators only.
- Implement strict monitoring and logging of CLI sessions to detect suspicious file operations.
🔍 How to Verify
Check if Vulnerable:
Check device version against Cisco advisory; if running an affected version and has read-only CLI users, it is vulnerable.Check Version:
show versionVerify Fix Applied:
Verify the device version is updated to a patched version listed in the Cisco advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual CLI session activity from read-only users
- File modification attempts in system logs
- Privilege escalation attempts
Network Indicators:
- N/A - Local exploitation only
SIEM Query:
Search for CLI command logs containing file overwrite patterns or privilege escalation attempts from non-admin users.