CVE-2025-55591
📋 TL;DR
This critical command injection vulnerability in TOTOLINK-A3002R routers allows attackers to execute arbitrary system commands via the devicemac parameter. Attackers can gain full control of affected devices, potentially compromising entire networks. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- TOTOLINK-A3002R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to persistent backdoor installation, network pivoting to internal systems, data exfiltration, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a foothold for further attacks.
If Mitigated
Limited impact if device is behind strict firewall rules, not internet-facing, and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept exists showing command injection via HTTP POST request. Exploitation requires network access to the router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check TOTOLINK official website for firmware updates. 2. Download latest firmware. 3. Access router web interface. 4. Navigate to firmware upgrade section. 5. Upload new firmware file. 6. Wait for reboot.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Access router settings → Security → Remote Management → Disable
Network Segmentation
allIsolate router management interface from untrusted networks
Configure firewall to block external access to port 80/443 on router
🧯 If You Can't Patch
- Replace affected devices with patched or different vendor equipment
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: System → Firmware Upgrade → Current VersionCheck Version:
curl -s http://router-ip/version or check web interfaceVerify Fix Applied:
Verify firmware version is newer than v4.0.0-B20230531.1404 and test if command injection payloads are blocked📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /formMapDel endpoint
- Suspicious commands in web server logs
- Multiple failed login attempts
Network Indicators:
- HTTP POST requests containing shell metacharacters in devicemac parameter
- Outbound connections from router to suspicious IPs
SIEM Query:
source="router_logs" AND (uri="/formMapDel" OR "devicemac" AND ("|" OR ";" OR "$" OR "`"))