CVE-2025-20306
📋 TL;DR
This vulnerability allows authenticated administrators on Cisco Secure Firewall Management Center to execute arbitrary commands as root due to insufficient input validation in HTTP parameters. Only administrators with valid credentials can exploit this flaw. Organizations using affected FMC versions are at risk.
💻 Affected Systems
- Cisco Secure Firewall Management Center (FMC)
📦 What is this software?
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
Secure Firewall Management Center by Cisco
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the FMC device allowing root-level command execution, potentially leading to network-wide firewall rule manipulation, credential harvesting, and lateral movement.
Likely Case
Privileged administrator with malicious intent or compromised credentials could execute limited commands to establish persistence or exfiltrate configuration data.
If Mitigated
With proper credential management and network segmentation, impact is limited to the FMC device itself without broader network compromise.
🎯 Exploit Status
Exploitation requires administrator credentials and knowledge of HTTP parameter manipulation. No public exploit available at advisory publication.
🛠️ 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-fmc-cmd-inj-HCRLpFyN
Restart Required: No
Instructions:
1. Review Cisco advisory for affected versions. 2. Upgrade to recommended fixed version. 3. Verify patch installation through version check.
🔧 Temporary Workarounds
Restrict Administrator Access
allLimit administrator accounts to only necessary personnel and implement strong credential policies
Network Segmentation
allIsolate FMC management interface from general network access
🧯 If You Can't Patch
- Implement strict access controls and monitor administrator account activity
- Deploy network-based intrusion detection for anomalous HTTP requests to FMC interface
🔍 How to Verify
Check if Vulnerable:
Check FMC software version against affected versions listed in Cisco advisoryCheck Version:
Check via FMC web interface: System > Updates > Version InformationVerify Fix Applied:
Confirm FMC version matches or exceeds fixed version specified in advisory📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests with crafted parameters to FMC interface
- Multiple failed authentication attempts followed by successful admin login
Network Indicators:
- Anomalous HTTP POST requests to FMC management interface with unusual parameter values
SIEM Query:
source="fmc_logs" AND (http_method="POST" AND uri_contains("/api/") AND params_contains_suspicious_chars)