CVE-2025-65202
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary operating system commands with root privileges on TRENDnet TEW-657BRM routers. Attackers can exploit the setup.cgi binary via HTTP parameters to gain complete control of affected devices. Users of TRENDnet TEW-657BRM routers running version 1.00.1 are affected.
💻 Affected Systems
- TRENDnet TEW-657BRM
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, intercept network traffic, pivot to internal networks, or use the device for botnet activities.
Likely Case
Attackers gain root shell access to modify router configuration, intercept credentials, or deploy malware on connected devices.
If Mitigated
Limited impact if strong network segmentation, authentication controls, and monitoring are in place to detect exploitation attempts.
🎯 Exploit Status
Exploit requires authentication but is trivial to execute once authenticated. Public GitHub repository contains proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check TRENDnet website for firmware updates. If available, download latest firmware and apply through router web interface.
🔧 Temporary Workarounds
Disable remote administration
allTurn off remote management features to prevent external exploitation
Change default credentials
allUse strong, unique passwords for router administration
🧯 If You Can't Patch
- Segment affected routers on isolated network segments
- Implement strict firewall rules to limit access to router administration interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface. If version is 1.00.1, device is vulnerable.Check Version:
Check router web interface at http://[router-ip]/ or use nmap scanVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.00.1📡 Detection & Monitoring
Log Indicators:
- HTTP requests to setup.cgi with command/todo/next_file parameters containing shell metacharacters
- Unusual command execution in router logs
Network Indicators:
- HTTP POST requests to setup.cgi with suspicious parameter values
- Outbound connections from router to unexpected destinations
SIEM Query:
source="router_logs" AND (uri="*/setup.cgi" AND (param="command" OR param="todo" OR param="next_file"))