CVE-2025-15218
📋 TL;DR
This vulnerability in Tenda AC10U routers allows remote attackers to execute arbitrary code via a buffer overflow in the lanMask parameter of the /goform/AdvSetLanip endpoint. Attackers can exploit this to take control of affected routers. Users running vulnerable firmware versions are at risk.
💻 Affected Systems
- Tenda AC10U
📦 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
Router takeover allowing attackers to modify DNS settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if the device is behind a firewall with strict inbound rules and network segmentation.
🎯 Exploit Status
Public exploit code is available and the vulnerability requires no authentication to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda's website for firmware updates. 2. Download the latest firmware. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web interface
Network Segmentation
allIsolate the router on a separate VLAN with restricted access
🧯 If You Can't Patch
- Replace the device with a supported model from a different vendor
- Implement strict network access controls to limit traffic to the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web 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 15.03.06.49📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/AdvSetLanip with long lanMask parameters
- Multiple failed buffer overflow attempts
Network Indicators:
- Unusual traffic patterns to router management interface
- Exploit kit traffic patterns
SIEM Query:
source="router_logs" AND uri="/goform/AdvSetLanip" AND method="POST" AND (lanMask.length > 50 OR contains(lanMask, "\x90"))