CVE-2025-67074
📋 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 running 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, persistent backdoor installation, and lateral movement to internal networks.
Likely Case
Denial of service causing router crashes and network disruption, requiring physical reset.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted.
🎯 Exploit Status
Exploit requires sending a crafted POST request to a specific endpoint. Public GitHub repository contains proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for AC10V4.0. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Access router admin panel -> System Tools -> Remote Management -> Disable
Block Vulnerable Endpoint
linuxUse firewall rules to block access to /goform/AdvSetMacMtuWan
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/AdvSetMacMtuWan" --algo bm -j DROP
🧯 If You Can't Patch
- Segment router on isolated network VLAN
- Implement strict firewall rules blocking all WAN-to-router management traffic
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System ToolsCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than V16.03.10.20 after update📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/AdvSetMacMtuWan with long serverName parameter
- Router crash/reboot logs
Network Indicators:
- Unusual POST requests to router management interface from external IPs
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
source="router_logs" AND uri="/goform/AdvSetMacMtuWan" AND method="POST" AND content_length>100