CVE-2025-15230
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda M3 routers via a heap-based buffer overflow in the formSetVlanPolicy function. Attackers can exploit this without authentication to potentially take full control of affected devices. All users running Tenda M3 version 1.0.0.13(4903) are affected.
💻 Affected Systems
- Tenda M3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal exploitation remains possible.
🎯 Exploit Status
Public exploit code exists in GitHub repositories, making this easily weaponizable. The vulnerability requires sending a specially crafted HTTP request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. If an update is available, download the latest firmware. 3. Log into the router's admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router after installation.
🔧 Temporary Workarounds
Network Segmentation and Access Control
allRestrict access to the router's management interface using firewall rules and network segmentation.
Disable Remote Management
allEnsure the router's remote management feature is disabled to prevent external exploitation.
🧯 If You Can't Patch
- Isolate affected routers in a dedicated VLAN with strict firewall rules blocking all unnecessary traffic.
- Replace vulnerable Tenda M3 routers with patched or alternative models if no firmware update becomes available.
🔍 How to Verify
Check if Vulnerable:
Check the router's firmware version via the web interface at System Status > Firmware Version. If it shows 1.0.0.13(4903), the device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep firmware_versionVerify Fix Applied:
After updating, verify the firmware version has changed from 1.0.0.13(4903) to a newer version.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/setVlanPolicyData with manipulated qvlan_truck_port parameter
- Multiple failed exploitation attempts or successful buffer overflow patterns in web logs
Network Indicators:
- HTTP traffic to router management interface containing suspicious payloads in POST data
- Unusual outbound connections from the router after exploitation
SIEM Query:
source="router_logs" AND (url="/goform/setVlanPolicyData" OR (method="POST" AND uri CONTAINS "setVlanPolicyData"))