CVE-2025-6149
📋 TL;DR
A critical buffer overflow vulnerability in TOTOLINK A3002R routers allows remote attackers to execute arbitrary code by sending specially crafted HTTP POST requests to the /boafrm/formSysLog endpoint. This affects TOTOLINK A3002R routers running firmware version 4.0.0-B20230531.1404. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- TOTOLINK A3002R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify device configuration, intercept network traffic, or use the device as a pivot point for further attacks.
If Mitigated
Denial of service or device crash if exploit fails or is blocked by network controls.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub, making this easily weaponizable by attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates. 2. Download latest firmware for A3002R. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Block External Access
linuxPrevent 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 affected routers in separate network segments with strict firewall rules
- Implement network-based intrusion detection to monitor for exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade section.Check Version:
curl -s http://router-ip/boafrm/formSysLog | grep -i version || check web interfaceVerify Fix Applied:
Verify firmware version has changed from 4.0.0-B20230531.1404 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /boafrm/formSysLog with long submit-url parameters
- Router crash or reboot logs
- Unusual process execution in system logs
Network Indicators:
- HTTP POST requests to /boafrm/formSysLog with abnormally long submit-url parameter
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
http.method:POST AND http.uri:"/boafrm/formSysLog" AND http.param.submit-url.length > 1000