CVE-2025-6090
📋 TL;DR
A critical buffer overflow vulnerability in H3C GR-5400AX routers allows remote attackers to execute arbitrary code by manipulating parameters in the UpdateWanparamsMulti/UpdateIpv6params functions. This affects organizations using H3C GR-5400AX V100R009L50 routers, potentially enabling complete system compromise.
💻 Affected Systems
- H3C GR-5400AX
⚠️ 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, network traffic interception, lateral movement into internal networks, and persistent backdoor installation.
Likely Case
Router crash/reboot causing service disruption, or limited code execution allowing configuration changes and credential theft.
If Mitigated
Denial of service from failed exploitation attempts if input validation or memory protections are partially effective.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making this easily weaponizable. The buffer overflow manipulation is straightforward once the attack vector is understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch exists as vendor assesses risk as low with no immediate remediation plans. Monitor H3C security advisories for updates.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected routers in separate network segments with strict firewall rules to limit attack surface.
Access Control Restrictions
linuxBlock external access to the vulnerable /routing/goform/aspForm endpoint using firewall rules or web application firewall.
iptables -A INPUT -p tcp --dport 80 -m string --string "/routing/goform/aspForm" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/routing/goform/aspForm" --algo bm -j DROP
🧯 If You Can't Patch
- Replace affected routers with different models or from vendors providing security updates
- Implement strict network monitoring and intrusion detection specifically for buffer overflow attempts against these routers
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System > System Info or via CLI command: display versionCheck Version:
display version | include GR-5400AXVerify Fix Applied:
No fix available to verify; monitor for firmware updates from H3C and verify version changes.📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to /routing/goform/aspForm with unusual parameter lengths
- Router crash/reboot logs without clear cause
- Unusual configuration changes to WAN or IPv6 settings
Network Indicators:
- Unusual traffic patterns to router management interface
- Exploit-like payloads in HTTP POST requests to the vulnerable endpoint
SIEM Query:
source="router_logs" AND (url="/routing/goform/aspForm" AND (param_length>1000 OR status=500))