CVE-2026-3814
📋 TL;DR
A buffer overflow vulnerability in UTT HiPER 810G routers allows remote attackers to execute arbitrary code by exploiting the strcpy function in the /goform/getOneApConfTempEntry endpoint. This affects all versions up to 1.7.7-1711. Attackers can compromise the router remotely without authentication.
💻 Affected Systems
- UTT HiPER 810G
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing remote code execution, router takeover, network traffic interception, and lateral movement into connected networks.
Likely Case
Router compromise leading to denial of service, credential theft, or deployment of malware for botnet participation.
If Mitigated
Limited impact if network segmentation isolates the router and strict access controls prevent external exploitation.
🎯 Exploit Status
Public exploit code is available on GitHub, making this easily weaponizable by attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates
2. If update available, download and verify checksum
3. Backup current configuration
4. Upload new firmware via web interface
5. Reboot router
6. Restore configuration if needed
🔧 Temporary Workarounds
Network Segmentation
allIsolate the router from untrusted networks and restrict access to management interface
Access Control Lists
linuxImplement firewall rules to block external access to the router's web interface
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace affected devices with supported models
- Implement strict network monitoring and anomaly detection for router traffic
🔍 How to Verify
Check if Vulnerable:
Check firmware version via router web interface at System > Firmware UpgradeCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Verify firmware version is above 1.7.7-1711 after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/getOneApConfTempEntry
- Multiple failed login attempts followed by buffer overflow patterns
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns matching exploit payloads
SIEM Query:
source="router_logs" AND (uri="/goform/getOneApConfTempEntry" AND (bytes>1024 OR contains(data,"\x90\x90\x90")))