CVE-2025-63460
📋 TL;DR
This vulnerability is a stack overflow in Totolink A7000R routers that allows attackers to cause a Denial of Service (DoS) by sending a specially crafted request to the ssid5g parameter. It affects users running Totolink A7000R firmware version 9.1.0u.6115_B20201022. Attackers can crash the device remotely without authentication.
💻 Affected Systems
- Totolink A7000R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, potential for remote code execution if combined with other vulnerabilities, and persistent service disruption.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore network connectivity for all connected devices.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access; DoS would only affect internal network users.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository; exploitation requires sending crafted HTTP request to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check Totolink official website for firmware updates. If available, download latest firmware and upload via router web interface under System Tools > Firmware Upgrade.
🔧 Temporary Workarounds
Restrict WAN Access
linuxBlock external access to router management interface using firewall rules.
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allTurn off remote management feature in router settings.
🧯 If You Can't Patch
- Isolate vulnerable router in separate network segment with strict access controls.
- Implement network monitoring for unusual HTTP requests to router management interface.
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status > Firmware Version.Check Version:
curl -s http://router-ip/status.cgi | grep firmwareVerify Fix Applied:
Verify firmware version has changed from v9.1.0u.6115_B20201022 to newer version.📡 Detection & Monitoring
Log Indicators:
- Unusually large HTTP POST requests to management interface
- Router crash/reboot logs
Network Indicators:
- HTTP requests with oversized ssid5g parameter to router IP
SIEM Query:
source="router.log" AND (http_request_size>1000 OR message="crash" OR message="reboot")