CVE-2025-60336
📋 TL;DR
A NULL pointer dereference vulnerability in TOTOLINK N600R routers allows attackers to crash the device via specially crafted HTTP requests, causing a denial of service. This affects users running vulnerable firmware versions, potentially disrupting network connectivity.
💻 Affected Systems
- TOTOLINK N600R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, extended network downtime, and potential loss of connectivity for all connected devices.
Likely Case
Temporary denial of service causing network disruption until device automatically reboots or is manually restarted.
If Mitigated
Limited impact with proper network segmentation and monitoring allowing quick detection and recovery.
🎯 Exploit Status
Public proof-of-concept available on GitHub; exploitation requires sending crafted HTTP request 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 N600R
3. Access router web interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Wait for reboot and verify version
🔧 Temporary Workarounds
Disable Web Management Interface
allPrevent access to vulnerable HTTP interface by disabling web management
Access router CLI via SSH/Telnet
Disable HTTP service if supported
Restrict Network Access
allLimit access to router management interface to trusted networks only
Configure firewall rules to block external access to router IP on port 80/443
🧯 If You Can't Patch
- Implement network segmentation to isolate router from untrusted networks
- Deploy intrusion detection/prevention systems to monitor for exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or About pageCheck Version:
curl -s http://router-ip/status.cgi | grep versionVerify Fix Applied:
Verify firmware version has been updated beyond v4.3.0cu.7866_B20220506📡 Detection & Monitoring
Log Indicators:
- HTTP requests to unusual endpoints
- Router crash/reboot events
- Connection timeouts to management interface
Network Indicators:
- HTTP requests with malformed headers or parameters to router IP
- Sudden loss of connectivity to router management interface
SIEM Query:
source="router.log" AND (http_uri="*sub_41773C*" OR http_status=500) OR event="device_reboot"