CVE-2025-6732
📋 TL;DR
A critical buffer overflow vulnerability in UTT HiPER 840G routers allows remote attackers to execute arbitrary code by exploiting the strcpy function in the API component. This affects all versions up to 3.1.1-190328. Attackers can compromise the device without authentication.
💻 Affected Systems
- UTT HiPER 840G
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to persistent backdoor installation, network traffic interception, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router configuration, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind firewall with strict inbound filtering, though internal attacks remain possible.
🎯 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 - vendor did not respond to disclosure
Restart Required: No
Instructions:
No official patch available. Consider replacing affected devices or implementing strict network controls.
🔧 Temporary Workarounds
Network Access Control
allRestrict access to the router's management interface using firewall rules
API Endpoint Blocking
allBlock access to the vulnerable /goform/setSysAdm endpoint
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict egress filtering
- Implement network segmentation to prevent lateral movement from compromised routers
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or CLI. If version is 3.1.1-190328 or earlier, device is vulnerable.Check Version:
Check via web interface at System > System Status or via CLI if availableVerify Fix Applied:
No fix available to verify. Monitor for vendor updates and check version after any potential future updates.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setSysAdm with long password parameters
- Multiple failed login attempts followed by successful exploitation
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- Traffic patterns indicating command and control communication
SIEM Query:
source="router_logs" AND (uri="/goform/setSysAdm" AND parameter_length>100) OR (process="unexpected" AND parent="router_process")