CVE-2025-4440
📋 TL;DR
A critical buffer overflow vulnerability in H3C GR-1800AX routers allows attackers to execute arbitrary code by manipulating the EnableIpv6 function's param argument. This affects all versions up to 100R008 and requires local network access for exploitation. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- H3C GR-1800AX
⚠️ 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
Remote code execution leading to full router compromise, credential theft, network pivoting, and persistent backdoor installation
Likely Case
Router crash/reboot causing service disruption, followed by potential malware deployment if attacker maintains access
If Mitigated
Denial of service with limited persistence due to network segmentation and monitoring
🎯 Exploit Status
Exploit code is publicly available on GitHub; manipulation of param argument leads to buffer overflow
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not provided in references
Restart Required: Yes
Instructions:
1. Check H3C official website for security advisories
2. If patch exists, download firmware update
3. Backup configuration
4. Upload and apply new firmware
5. Reboot router
6. Verify fix
🔧 Temporary Workarounds
Disable IPv6 functionality
allDisable IPv6 features to prevent access to vulnerable endpoint
Router-specific commands not available; use web interface to disable IPv6
Network segmentation
allIsolate router management interface to trusted networks only
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the router management interface
- Deploy network monitoring and intrusion detection for buffer overflow attempts on port 80/443
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or CLI; if version is 100R008 or earlier, device is vulnerableCheck Version:
Router-specific; typically via web interface at System > Firmware or CLI 'display version'Verify Fix Applied:
Verify firmware version is above 100R008; test IPv6 functionality remains operational📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/aspForm with EnableIpv6 parameter
- Router crash/reboot logs
- Buffer overflow error messages
Network Indicators:
- Multiple malformed requests to router management interface
- Unexpected outbound connections from router
SIEM Query:
source="router_logs" AND (url="/goform/aspForm" AND parameter="EnableIpv6")