CVE-2025-63464
📋 TL;DR
This CVE describes a stack overflow vulnerability in Totolink LR350 routers via the ssid parameter. Attackers can exploit this to cause Denial of Service (DoS) through crafted requests. Users of Totolink LR350 routers with the affected firmware are vulnerable.
💻 Affected Systems
- Totolink LR350
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, potential remote code execution if stack overflow can be controlled precisely
Likely Case
Router becomes unresponsive, requiring reboot to restore functionality
If Mitigated
Minimal impact if router is behind firewall with restricted WAN access
🎯 Exploit Status
Public GitHub repository contains exploit details; DoS exploitation is straightforward
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Totolink website for firmware updates
2. Download latest firmware for LR350
3. Access router admin interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router
🔧 Temporary Workarounds
Restrict WAN access
linuxBlock external access to router management interface
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable remote management
allTurn off remote administration features
🧯 If You Can't Patch
- Isolate router on separate network segment
- Implement network monitoring for abnormal requests to ssid parameter
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade sectionCheck Version:
curl -s http://router-ip/cgi-bin/luci/ | grep firmwareVerify Fix Applied:
Verify firmware version has changed from v9.3.5u.6369_B20220309 to newer version📡 Detection & Monitoring
Log Indicators:
- Multiple connection attempts to router management interface
- Router crash/reboot events in system logs
Network Indicators:
- Unusual HTTP POST requests containing long ssid parameters
- Traffic patterns indicating DoS attempts
SIEM Query:
source="router_logs" AND (event="crash" OR event="reboot") AND device_model="LR350"