CVE-2025-3988
📋 TL;DR
A critical buffer overflow vulnerability in TOTOLINK N150RT routers allows remote attackers to execute arbitrary code by manipulating the service_type parameter in the formPortFw endpoint. This affects all users running the vulnerable firmware version. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- TOTOLINK N150RT
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic interception, DNS manipulation, and network disruption.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public exploit code available on GitHub, requires no authentication, and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.totolink.net/
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates 2. Download latest firmware 3. Access router admin panel 4. Navigate to firmware upgrade section 5. Upload new firmware file 6. Wait for reboot
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router web interface
Access router admin panel → System Tools → Remote Management → Disable
Network segmentation
linuxIsolate router management interface to trusted network
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_NET -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace affected devices with supported models
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin panel under System Status → Firmware VersionCheck Version:
curl -s http://router-ip/ | grep -i firmwareVerify Fix Applied:
Verify firmware version has changed from 3.4.0-B20190525📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /boafrm/formPortFw with long service_type parameters
- Unusual process creation in router logs
Network Indicators:
- Exploit traffic patterns matching public PoC
- Unexpected outbound connections from router
SIEM Query:
source="router.log" AND uri="/boafrm/formPortFw" AND (service_type.length > 100 OR status=500)