CVE-2025-64126
📋 TL;DR
This critical OS command injection vulnerability allows unauthenticated attackers to execute arbitrary commands on affected systems by injecting malicious input into a parameter that should only accept IP addresses. It affects Zenitel VS-IS firmware and potentially other products that use similar vulnerable code. Organizations using these systems are at immediate risk of complete compromise.
💻 Affected Systems
- Zenitel VS-IS firmware
⚠️ 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 system compromise leading to ransomware deployment, data exfiltration, or use as a pivot point into internal networks
Likely Case
Remote code execution allowing attackers to install backdoors, steal credentials, or disrupt operations
If Mitigated
Limited impact if network segmentation and strict input validation are in place
🎯 Exploit Status
CVSS 10.0 indicates trivial exploitation with maximum impact. The vulnerability pattern is well-known and easy to weaponize.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://wiki.zenitel.com/wiki/Downloads#Station_and_Device_Firmware_Package_.28VS-IS.29
Restart Required: Yes
Instructions:
1. Check Zenitel advisory for patched firmware version. 2. Download updated firmware from vendor portal. 3. Backup current configuration. 4. Apply firmware update following vendor instructions. 5. Verify update completed successfully.
🔧 Temporary Workarounds
Network Segmentation
linuxIsolate affected systems from internet and restrict network access
iptables -A INPUT -s 0.0.0.0/0 -p tcp --dport [PORT] -j DROP
Input Validation Proxy
allDeploy a reverse proxy that validates parameter input before forwarding to vulnerable system
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems
- Deploy web application firewall with command injection rules
🔍 How to Verify
Check if Vulnerable:
Check if system runs Zenitel VS-IS firmware and has parameter accepting IP addresses without proper validationCheck Version:
Check device web interface or CLI for firmware version informationVerify Fix Applied:
Verify firmware version matches patched version from vendor advisory and test parameter with malicious input📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed parameter validation attempts
- Suspicious characters in parameter values
Network Indicators:
- Unexpected outbound connections from affected systems
- Command and control traffic patterns
SIEM Query:
source="device_logs" AND (param="*;*" OR param="*|*" OR param="*`*" OR param="*$(*" OR param="*&*" OR param="*>" OR param="*<*")