CVE-2025-63459
📋 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 exploit this remotely without authentication to crash the router.
💻 Affected Systems
- Totolink A7000R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, potentially leading to extended network downtime and service disruption.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality, causing temporary network outage.
If Mitigated
Minimal impact if router is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public GitHub repository contains technical details and likely exploit code. The vulnerability requires no authentication and has simple exploitation requirements.
🛠️ 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 apply through router web interface.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Network Segmentation
allIsolate router management interface to trusted network segments only
🧯 If You Can't Patch
- Implement strict firewall rules to block all WAN access to router management interface
- Monitor router logs for unusual activity and reboot patterns
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface. If version is exactly v9.1.0u.6115_B20201022, system is vulnerable.Check Version:
Login to router web interface and navigate to System Status or About page to check firmware version.Verify Fix Applied:
Verify firmware version has changed from v9.1.0u.6115_B20201022 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Router crash/reboot events
- Unusual requests to management interface with long ssid5g parameters
Network Indicators:
- Multiple malformed HTTP requests to router management interface
- Sudden loss of connectivity to router
SIEM Query:
source="router_logs" AND (event="crash" OR event="reboot") OR http_uri="*ssid5g*" AND length(http_param)>100