CVE-2025-25457
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AC10 routers via a buffer overflow in the AdvSetMacMtuWan function. Attackers can exploit this by sending specially crafted requests to the cloneType2 parameter. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda AC10
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if the router is behind a firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public proof-of-concept code is available, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for AC10. 3. Log into router admin panel. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external attackers from accessing the vulnerable interface
Log into router admin panel
Navigate to Advanced > System Tools > Remote Management
Disable remote management
Restrict WAN Access
linuxBlock external access to router management interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate the router on a dedicated network segment with strict firewall rules
- Implement network monitoring to detect exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin panel under System Status or System Tools > Firmware UpgradeCheck Version:
curl -s http://router-ip/ | grep -i firmware || ssh admin@router-ip 'cat /proc/version'Verify Fix Applied:
Verify firmware version has been updated to a version newer than V16.03.10.20📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/AdvSetMacMtuWan
- Multiple failed authentication attempts followed by successful access
- Unexpected process execution or memory errors in system logs
Network Indicators:
- HTTP requests with long strings in cloneType2 parameter
- Traffic to router management interface from unexpected external IPs
- Unusual outbound connections from router
SIEM Query:
source="router-logs" AND (uri="/goform/AdvSetMacMtuWan" OR uri="*cloneType2*")