CVE-2025-10756
📋 TL;DR
A buffer overflow vulnerability in UTT HiPER 840G routers allows remote attackers to execute arbitrary code by manipulating the tempName parameter in the /goform/getOneApConfTempEntry endpoint. This affects all versions up to 3.1.1-190328. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- UTT HiPER 840G
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, data exfiltration, and use as pivot point for lateral movement.
Likely Case
Remote code execution resulting in device takeover, configuration changes, credential theft, and deployment of persistent malware.
If Mitigated
Denial of service or limited information disclosure if exploit fails or is partially mitigated by network controls.
🎯 Exploit Status
Proof of concept exploit code is publicly available on GitHub. The vulnerability requires no authentication and has simple exploitation requirements.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Contact vendor UTT for firmware updates. If unavailable, implement workarounds or replace hardware.
🔧 Temporary Workarounds
Network Access Control
linuxBlock external access to router web interface and restrict internal access to trusted IPs only.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Web Application Firewall
allDeploy WAF rules to block requests containing buffer overflow patterns to the vulnerable endpoint.
ModSecurity rule: SecRule REQUEST_URI "@contains /goform/getOneApConfTempEntry" "id:1001,phase:1,deny,status:403"
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict network segmentation
- Implement outbound traffic monitoring for suspicious connections from router IPs
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at System > System Info or via SSH: cat /etc/versionCheck Version:
ssh admin@router-ip 'cat /etc/version' or check web interfaceVerify Fix Applied:
Verify firmware version is above 3.1.1-190328. Test endpoint access: curl -X POST http://router-ip/goform/getOneApConfTempEntry📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/getOneApConfTempEntry with long tempName parameter
- Unusual process execution or system command logs from router
Network Indicators:
- Unusual outbound connections from router IP
- Traffic spikes to/from router management interface
SIEM Query:
source="router-logs" AND uri="/goform/getOneApConfTempEntry" AND (param_length(tempName) > 100 OR status=500)