CVE-2025-5738
📋 TL;DR
A critical buffer overflow vulnerability in TOTOLINK X15 routers allows remote attackers to execute arbitrary code by sending specially crafted HTTP POST requests to the /boafrm/formStats endpoint. This affects TOTOLINK X15 routers running firmware version 1.0.0-B20230714.1105. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- TOTOLINK X15
📦 What is this software?
X15 Firmware by Totolink
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, installation of persistent malware, and creation of botnet nodes.
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 limited information disclosure if exploit attempts are blocked by network controls.
🎯 Exploit Status
Public exploit code is available, and the vulnerability requires minimal technical skill to exploit due to the straightforward buffer overflow.
🛠️ 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 X15 model. 3. Access router web interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router after update completes.
🔧 Temporary Workarounds
Block External Access to Web Interface
linuxPrevent external exploitation by blocking inbound HTTP/HTTPS access to router management interface
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 to prevent external access
🧯 If You Can't Patch
- Isolate affected routers in separate network segments with strict firewall rules
- Implement network-based intrusion prevention systems (IPS) to detect and block exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status or About page. If version matches 1.0.0-B20230714.1105, device is vulnerable.Check Version:
curl -s http://router-ip/boafrm/formSysCmd | grep -i version || Check web interface manuallyVerify Fix Applied:
After firmware update, verify version has changed from 1.0.0-B20230714.1105 and test that /boafrm/formStats endpoint no longer accepts malformed POST requests.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /boafrm/formStats with long submit-url parameters
- Router crash/reboot logs following HTTP requests
Network Indicators:
- HTTP POST requests to /boafrm/formStats with unusually long submit-url parameter (>1000 characters)
- Traffic patterns showing buffer overflow exploitation attempts
SIEM Query:
source="router_logs" AND uri="/boafrm/formStats" AND method="POST" AND (param_length(submit-url) > 1000 OR contains(param_value, shellcode_patterns))