CVE-2025-63466
📋 TL;DR
This vulnerability is a stack overflow in the Totolink LR350 router's password parameter handling that allows attackers to cause Denial of Service (DoS) via crafted requests. Attackers can crash the device or potentially execute arbitrary code. Organizations using Totolink LR350 routers with vulnerable firmware are affected.
💻 Affected Systems
- Totolink LR350
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and network infiltration
Likely Case
Denial of Service causing router crashes and network disruption requiring physical reset
If Mitigated
Limited to DoS impact with proper network segmentation and access controls
🎯 Exploit Status
Public proof-of-concept available on GitHub; exploitation requires sending crafted requests to vulnerable endpoint
🛠️ 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 after update
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface from untrusted networks
Access Control Lists
linuxRestrict access to router management interface to trusted IPs only
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace vulnerable router with updated model or different vendor
- Implement network monitoring for exploitation attempts and anomalous traffic patterns
🔍 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 -i versionVerify Fix Applied:
Verify firmware version is newer than v9.3.5u.6369_B20220309 and test with known exploit payloads📡 Detection & Monitoring
Log Indicators:
- Repeated connection attempts to vulnerable endpoint
- Router crash/reboot events in system logs
- Unusual large password parameter values in web logs
Network Indicators:
- HTTP POST requests with abnormally long password parameters to router management interface
- Traffic patterns indicating DoS attempts
SIEM Query:
source="router_logs" AND ("sub_426EF8" OR "password parameter overflow" OR "connection reset" OR "segmentation fault")