CVE-2025-20238
📋 TL;DR
This vulnerability allows authenticated local attackers with administrative credentials to execute arbitrary commands with root privileges on Cisco ASA and FTD firewalls. Attackers can exploit insufficient input validation in specific commands to gain full system control. Organizations using affected Cisco firewall versions 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
Complete compromise of firewall device allowing attacker to pivot to internal networks, exfiltrate data, disrupt network operations, or install persistent backdoors.
Likely Case
Privileged attacker gains root access to firewall, potentially modifying configurations, intercepting traffic, or using device as foothold for lateral movement.
If Mitigated
With proper access controls and monitoring, exploitation would be detected and contained, limiting damage to single device.
🎯 Exploit Status
Exploitation requires administrative access and knowledge of vulnerable commands. No public exploit code available at time of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Cisco advisory for 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. Download and apply appropriate fixed software version. 3. Verify patch installation and functionality.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit administrative access to only trusted users and implement strong authentication controls
Implement Command Monitoring
allMonitor and log all administrative command execution on affected devices
🧯 If You Can't Patch
- Implement strict access controls and multi-factor authentication for administrative accounts
- Segment network to limit firewall exposure and implement network monitoring for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check device version against affected versions listed in Cisco advisoryCheck Version:
show versionVerify Fix Applied:
Verify installed version matches or exceeds fixed version from Cisco advisory📡 Detection & Monitoring
Log Indicators:
- Unusual administrative command execution patterns
- Multiple failed authentication attempts followed by successful login
- Commands with unusual parameters or syntax
Network Indicators:
- Unexpected outbound connections from firewall
- Changes to firewall rules or configurations
SIEM Query:
source="cisco_asa" AND (event_type="command_execution" AND command="*crafted*" OR user="admin" AND result="success" AND command_count>10)