CVE-2025-6402
📋 TL;DR
This 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/formIpv6Setup endpoint. The vulnerability affects TOTOLINK X15 routers running firmware version 1.0.0-B20230714.1105, potentially enabling complete device compromise.
💻 Affected Systems
- TOTOLINK X15
📦 What is this software?
X15 Firmware by Totolink
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network traffic interception, and lateral movement into connected networks.
Likely Case
Router takeover enabling man-in-the-middle attacks, DNS hijacking, and creation of persistent backdoors.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit code exists; attack requires sending crafted HTTP POST requests to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.totolink.net/
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates 2. Download latest firmware 3. Upload via router admin interface 4. Reboot router
🔧 Temporary Workarounds
Block Vulnerable Endpoint
linuxUse firewall rules to block access to /boafrm/formIpv6Setup endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/boafrm/formIpv6Setup" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/boafrm/formIpv6Setup" --algo bm -j DROP
Disable Remote Admin
allDisable remote administration features on router
🧯 If You Can't Patch
- Segment router on isolated network segment with strict firewall rules
- Implement network monitoring for suspicious HTTP POST requests to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface; if version is 1.0.0-B20230714.1105, device is vulnerable.Check Version:
Login to router admin interface and check System Status or Firmware Update sectionVerify Fix Applied:
Verify firmware version has changed from vulnerable version; test with controlled exploit attempt if possible.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /boafrm/formIpv6Setup with unusual payloads
- Router reboot events following suspicious requests
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains from router
SIEM Query:
source="router_logs" AND (url="/boafrm/formIpv6Setup" OR method="POST" AND uri CONTAINS "formIpv6Setup")