CVE-2026-2935
📋 TL;DR
This CVE describes a remote buffer overflow vulnerability in UTT HiPER 810G routers. Attackers can exploit the strcpy function in the ConfigExceptMSN endpoint by manipulating the remark parameter, potentially allowing remote code execution. All users running UTT HiPER 810G firmware versions up to 1.7.7-171114 are affected.
💻 Affected Systems
- UTT HiPER 810G
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attackers could execute arbitrary code with router privileges, potentially gaining full control of the device, intercepting network traffic, or using it as a foothold for lateral movement.
Likely Case
Remote code execution leading to device compromise, service disruption, or credential theft from the router configuration.
If Mitigated
If properly segmented and firewalled, impact may be limited to the router itself without network-wide compromise.
🎯 Exploit Status
Public exploit available on GitHub. Remote exploitation requires no authentication. Buffer overflow via strcpy is a well-understood attack vector.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Check vendor website for firmware updates beyond version 1.7.7-171114.
🔧 Temporary Workarounds
Block Web Interface Access
linuxRestrict access to router web interface from untrusted networks
iptables -A INPUT -p tcp --dport 80 -s ! TRUSTED_NETWORK -j DROP
iptables -A INPUT -p tcp --dport 443 -s ! TRUSTED_NETWORK -j DROP
Disable Remote Management
allTurn off remote management features in router configuration
🧯 If You Can't Patch
- Segment router management interface to isolated VLAN
- Implement network-based intrusion detection for buffer overflow patterns
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status > Firmware VersionCheck Version:
curl -s http://ROUTER_IP/goform/GetSysInfo | grep FirmwareVerify Fix Applied:
Verify firmware version is newer than 1.7.7-171114📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/ConfigExceptMSN
- Large payloads in remark parameter
- Router crash/restart logs
Network Indicators:
- HTTP requests with oversized remark parameters
- Traffic to router management interface from unexpected sources
SIEM Query:
source="router_logs" AND uri="/goform/ConfigExceptMSN" AND (remark.length>100 OR status=500)