CVE-2026-3699
📋 TL;DR
A buffer overflow vulnerability in UTT HiPER 810G routers allows remote attackers to execute arbitrary code or crash the device by exploiting improper bounds checking in the strcpy function. This affects all versions up to 1.7.7-171114, potentially compromising network security and device control.
💻 Affected Systems
- UTT HiPER 810G
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device takeover, network compromise, and lateral movement into connected systems.
Likely Case
Device crash causing service disruption, or limited code execution for reconnaissance and persistence.
If Mitigated
Denial of service from crash if exploit fails, with minimal data exposure.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making attacks straightforward for threat actors.
🛠️ 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 exists, download and install via web interface. 3. Reboot device after update. 4. Verify version is above 1.7.7-171114.
🔧 Temporary Workarounds
Network Segmentation
allIsolate the router from untrusted networks to limit attack surface.
Access Control Lists
linuxRestrict access to the web management interface to trusted IPs only.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace device with a supported model if no patch is available.
- Monitor network traffic for exploitation attempts and implement intrusion detection.
🔍 How to Verify
Check if Vulnerable:
Access router web interface, navigate to System Status or About page, check firmware version.Check Version:
curl -s http://router-ip/status.cgi | grep versionVerify Fix Applied:
Confirm firmware version is above 1.7.7-171114 after update.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formRemoteControl
- Device crash or reboot logs
Network Indicators:
- Spike in traffic to router management port (80/443)
- Malformed HTTP requests with long strings
SIEM Query:
source="router_logs" AND uri="/goform/formRemoteControl" AND method="POST" AND size>1000