CVE-2025-20237
📋 TL;DR
This vulnerability allows authenticated local attackers with administrative credentials to execute arbitrary commands with root privileges on Cisco ASA and FTD devices. Attackers can exploit insufficient input validation by submitting crafted commands after authentication. Organizations using affected Cisco firewall products are at risk.
💻 Affected Systems
- Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
- Cisco Secure Firewall Threat Defense (FTD) Software
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing attacker to install persistent backdoors, exfiltrate configuration data, pivot to internal networks, or disable security controls.
Likely Case
Privilege escalation leading to configuration changes, credential harvesting, or lateral movement within the network.
If Mitigated
Limited impact due to strong access controls, network segmentation, and monitoring preventing unauthorized administrative access.
🎯 Exploit Status
Requires valid administrative credentials and knowledge of specific vulnerable 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-asaftd-cmdinj-VEhFeZQ3
Restart Required: No
Instructions:
1. Review Cisco advisory for affected versions. 2. Upgrade to fixed versions listed in advisory. 3. Apply patches following Cisco's upgrade procedures. 4. Verify patch installation.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit administrative access to trusted IP addresses and users only
configure terminal
aaa authentication ssh console LOCAL
access-list ADMIN-ACCESS permit ip trusted-host any
ssh trusted-host access-list ADMIN-ACCESS
Implement Command Authorization
allUse TACACS+ or RADIUS with command authorization to restrict available commands
aaa authorization exec default group tacacs+ local
aaa authorization commands 1 default group tacacs+ local
🧯 If You Can't Patch
- Implement strict access controls limiting administrative access to essential personnel only
- Enable comprehensive logging and monitoring of all administrative sessions and command execution
🔍 How to Verify
Check if Vulnerable:
Check device version against affected versions in Cisco advisoryCheck Version:
show version | include VersionVerify Fix Applied:
Verify device is running fixed version from Cisco advisory📡 Detection & Monitoring
Log Indicators:
- Unusual administrative login patterns
- Execution of unexpected commands by admin users
- Failed command authorization attempts
Network Indicators:
- Unusual administrative SSH/Telnet connections
- Anomalous outbound connections from firewall management interfaces
SIEM Query:
source="cisco-asa" (event_type="command" AND command="*crafted*" OR command="*unusual*")