CVE-2025-29214
📋 TL;DR
Tenda AX12 routers running firmware version 22.03.01.46_CN contain a stack-based buffer overflow vulnerability in the setMacFilterCfg function. This allows remote attackers to execute arbitrary code or cause denial of service by sending specially crafted requests. Only users with this specific firmware version are affected.
💻 Affected Systems
- Tenda AX12
📦 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 connected networks.
Likely Case
Denial of service causing router crashes and network disruption, potentially requiring physical reset.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted.
🎯 Exploit Status
Proof-of-concept details are publicly available in the provided references. Exploitation requires access to the router's web interface or API endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Tenda's official website for updated firmware
Vendor Advisory: Not publicly available at time of analysis
Restart Required: Yes
Instructions:
1. Visit Tenda's official support website. 2. Download the latest firmware for AX12. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the vulnerable interface
Network Segmentation
allIsolate the router from critical internal networks
🧯 If You Can't Patch
- Replace the router with a different model or vendor
- Implement strict network access controls to limit who can reach the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or similar sectionCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Confirm firmware version is no longer v22.03.01.46_CN after update📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to /goform/setMacFilterCfg
- Router crash/reboot events in system logs
- Unusual POST requests with large payloads
Network Indicators:
- Unusual traffic patterns to router management port
- HTTP requests with oversized parameters to vulnerable endpoint
SIEM Query:
source="router_logs" AND (uri="/goform/setMacFilterCfg" OR message="crash" OR message="reboot")