CVE-2025-6485
📋 TL;DR
This critical vulnerability allows remote attackers to execute arbitrary operating system commands on TOTOLINK A3002R routers by manipulating the wlanif parameter in the formWlSiteSurvey function. Attackers can exploit this without authentication to gain full control of affected devices. All users running the vulnerable firmware version are at risk.
💻 Affected Systems
- TOTOLINK A3002R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, pivot to internal networks, intercept all network traffic, and use the device for botnet activities.
Likely Case
Remote code execution leading to device takeover, credential theft, DNS hijacking, and participation in DDoS attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and command execution is sandboxed.
🎯 Exploit Status
Public exploit code is available on GitHub. The vulnerability requires no authentication and has simple exploitation steps.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.totolink.net/
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload new firmware file. 6. Wait for reboot and verify version.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the vulnerable web interface
Access router admin > Network > WAN > Disable 'Remote Management' or 'Web Access from WAN'
Restrict Management Interface Access
linuxLimit access to router management interface using firewall rules
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
- Isolate affected routers in separate network segments with strict firewall rules
- Implement network monitoring for unusual outbound connections from routers
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System > Firmware Upgrade. If version is 1.1.1-B20200824.0128, device is vulnerable.Check Version:
curl -s http://router-ip/boafrm/formWlSiteSurvey?wlanif=test || check web interfaceVerify Fix Applied:
After firmware update, verify version has changed from 1.1.1-B20200824.0128. Test the vulnerable endpoint with safe payloads to confirm command injection is blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual POST/GET requests to /boafrm/formWlSiteSurvey with shell metacharacters
- Unexpected command execution in system logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- DNS queries to suspicious domains from router
- Unexpected SSH/Telnet connections originating from router
SIEM Query:
source="router_logs" AND (uri="/boafrm/formWlSiteSurvey" AND (query CONTAINS "|" OR query CONTAINS ";" OR query CONTAINS "`" OR query CONTAINS "$"))