CVE-2025-4730
📋 TL;DR
This critical buffer overflow vulnerability in TOTOLINK A3002R/A3002RU routers allows remote attackers to execute arbitrary code by sending specially crafted HTTP POST requests to the /boafrm/formMapDel endpoint. The vulnerability affects devices running firmware version 3.0.0-B20230809.1615 and can be exploited without authentication.
💻 Affected Systems
- TOTOLINK A3002R
- TOTOLINK A3002RU
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, 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
Limited impact if devices are behind firewalls with strict inbound rules, though internal network compromise remains possible.
🎯 Exploit Status
Public exploit code exists in GitHub repositories, making this easily weaponizable. The vulnerability requires no authentication and has a straightforward exploitation path.
🛠️ 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 for your model. 3. Access router web interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Web Management Interface
allPrevent access to the vulnerable HTTP POST handler by disabling the web interface
Access router CLI via SSH/Telnet
Navigate to web interface settings
Disable HTTP/HTTPS management
Network Segmentation
allIsolate affected routers from critical network segments
Configure firewall rules to restrict access to router management IP
Create separate VLAN for management interfaces
🧯 If You Can't Patch
- Block inbound access to router web interface (ports 80/443) at network perimeter
- Implement strict network segmentation to limit router exposure to trusted management networks only
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or About page. If version is exactly 3.0.0-B20230809.1615, device is vulnerable.Check Version:
curl -s http://router-ip/ | grep -i 'firmware\|version' or check web interface System Status pageVerify Fix Applied:
After firmware update, verify version has changed from 3.0.0-B20230809.1615. Test by attempting to access /boafrm/formMapDel endpoint with monitoring for crashes.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /boafrm/formMapDel with abnormal parameter lengths
- Router crash/restart logs
- Unusual process execution in router logs
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with devicemac1 parameter exceeding normal length
- Abnormal outbound connections from router after exploitation
SIEM Query:
source="router_logs" AND (url_path="/boafrm/formMapDel" OR message="buffer overflow" OR message="segmentation fault")