CVE-2025-5786
📋 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/formDMZ 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, creation of persistent backdoors, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router configuration, intercept network traffic, or use the device as a pivot point for further attacks.
If Mitigated
Denial of service or temporary disruption if exploit attempts are blocked by network controls.
🎯 Exploit Status
Public exploit code is available on GitHub, making this easily weaponizable. The attack requires sending a single crafted HTTP request.
🛠️ 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
allConfigure firewall rules to block external access to router web management interface (typically port 80/HTTP).
Disable DMZ Functionality
allIf DMZ feature is not required, disable it in router configuration to remove vulnerable endpoint.
🧯 If You Can't Patch
- Isolate affected routers in separate network segments with strict firewall rules
- Implement network monitoring for exploit attempts and block malicious IPs
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status > Firmware Version. If version is 1.0.0-B20230714.1105, device is vulnerable.Check Version:
curl -s http://router-ip/boafrm/formSysCmd | grep -i versionVerify Fix Applied:
After firmware update, verify version has changed from 1.0.0-B20230714.1105 to a newer version.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /boafrm/formDMZ with unusually long submit-url parameter
- Router crash or reboot logs following HTTP requests
Network Indicators:
- HTTP traffic to router IP on port 80 with POST requests to /boafrm/formDMZ
- Unusual outbound connections from router after exploitation
SIEM Query:
source="router_logs" AND (uri="/boafrm/formDMZ" OR method="POST" AND uri CONTAINS "formDMZ")