CVE-2026-0839
📋 TL;DR
This is a remote buffer overflow vulnerability in UTT 进取 520W router firmware version 1.7.7-180627. Attackers can exploit the strcpy function in the /goform/APSecurity endpoint by manipulating the wepkey1 parameter to execute arbitrary code. Organizations using this specific router firmware version are affected.
💻 Affected Systems
- UTT 进取 520W
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and potential lateral movement to other systems.
Likely Case
Remote code execution allowing attackers to take control of the router, intercept network traffic, or use it as a foothold for further attacks.
If Mitigated
Limited impact if network segmentation isolates the router and proper monitoring detects exploitation attempts.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making attacks straightforward for threat actors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch exists as the vendor did not respond to disclosure. Consider replacing the device or applying workarounds.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the vulnerable endpoint by disabling remote administration features.
Access router web interface > Administration > Remote Management > Disable
Network Segmentation
allIsolate the router from critical network segments to limit potential damage if exploited.
🧯 If You Can't Patch
- Replace the affected router with a supported model from a responsive vendor.
- Implement strict network access controls to limit traffic to the router's management interface.
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: Login > System > Firmware Version. If version is 1.7.7-180627, device is vulnerable.Check Version:
No CLI command available; use web interface as described.Verify Fix Applied:
Verify firmware version has changed from 1.7.7-180627 or that workarounds like remote management disablement are active.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/APSecurity with long wepkey1 parameters
- Router reboot or crash logs
Network Indicators:
- Suspicious traffic patterns to router management port (typically 80/443)
- Exploit kit traffic matching public PoC signatures
SIEM Query:
source="router_logs" AND uri="/goform/APSecurity" AND (param="wepkey1" AND length>100)