CVE-2025-67073
📋 TL;DR
A buffer overflow vulnerability in Tenda AC10V4.0 routers allows remote attackers to cause denial of service or potentially execute arbitrary code by sending a specially crafted POST request to the /goform/AdvSetMacMtuWan endpoint. This affects users of Tenda AC10V4.0 routers with firmware version V16.03.10.20.
💻 Affected Systems
- Tenda AC10V4.0
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and persistent backdoor installation.
Likely Case
Denial of service causing router crashes and network disruption, with potential for limited code execution.
If Mitigated
Network segmentation and proper firewall rules prevent exploitation attempts from reaching vulnerable devices.
🎯 Exploit Status
The GitHub reference contains technical details and proof-of-concept code. Exploitation requires sending a single HTTP POST request with crafted payload.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check Tenda's official website for firmware updates. If available, download and install the latest firmware through the router's web interface.
🔧 Temporary Workarounds
Block HTTP Access
linuxBlock external access to router's web interface on port 80
iptables -A INPUT -p tcp --dport 80 -j DROP
Disable Remote Management
allDisable remote administration in router settings
🧯 If You Can't Patch
- Segment router management interface to internal network only
- Implement WAF rules to block requests to /goform/AdvSetMacMtuWan
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface. If version is V16.03.10.20, device is vulnerable.Check Version:
curl -s http://router-ip/ | grep -i firmwareVerify Fix Applied:
Verify firmware version has been updated to a version later than V16.03.10.20📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/AdvSetMacMtuWan with unusual payload lengths
- Router crash/restart logs
Network Indicators:
- HTTP traffic to router port 80 with POST requests containing crafted serviceName field
SIEM Query:
source="router_logs" AND (url="/goform/AdvSetMacMtuWan" OR message="crash" OR message="restart")