CVE-2026-1139
📋 TL;DR
A buffer overflow vulnerability in UTT 进取 520W firmware version 1.7.7-180627 allows remote attackers to execute arbitrary code or cause denial of service. The vulnerability exists in the strcpy function within the /goform/ConfigExceptMSN file, enabling remote exploitation without authentication. Organizations using this specific router model and firmware version are affected.
💻 Affected Systems
- UTT 进取 520W router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Denial of service causing router crashes or instability, potentially disrupting network connectivity.
If Mitigated
Limited impact if network segmentation isolates the router and prevents external access to vulnerable interfaces.
🎯 Exploit Status
Exploit details are publicly available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch exists. Contact UTT vendor for updated firmware. If unavailable, consider replacing the device.
🔧 Temporary Workarounds
Network segmentation
allIsolate the router from untrusted networks and restrict access to management interfaces.
Use firewall rules to block external access to router management ports (typically 80, 443, 8080)
Disable vulnerable function
allIf possible, disable or restrict access to the /goform/ConfigExceptMSN endpoint.
Check router configuration for URL filtering or access control options
🧯 If You Can't Patch
- Replace the router with a different model from a vendor that provides security updates
- Implement strict network access controls to prevent external and unauthorized internal access to the router
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or CLI. If version is 1.7.7-180627, the device is vulnerable.Check Version:
Login to router web interface and check System Status or Firmware Information pageVerify Fix Applied:
Verify firmware has been updated to a version later than 1.7.7-180627 (if available from vendor).📡 Detection & Monitoring
Log Indicators:
- Multiple failed access attempts to /goform/ConfigExceptMSN
- Router crash/reboot logs
- Unusual outbound connections from router
Network Indicators:
- Unusual traffic patterns to router management ports
- Exploit-specific payloads in network traffic
SIEM Query:
source_ip="router_ip" AND (url_path="/goform/ConfigExceptMSN" OR event_type="buffer_overflow")