CVE-2026-2137
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda TX3 routers via a buffer overflow in the SetIpMacBind function. Attackers can exploit this without authentication to potentially take full control of affected devices. All users of Tenda TX3 routers up to version 16.03.13.11_multi are affected.
💻 Affected Systems
- Tenda TX3
📦 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 devices are behind firewalls with strict inbound filtering, though internal network compromise remains possible.
🎯 Exploit Status
Public proof-of-concept code exists, 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. If available, download the latest firmware. 3. Log into router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the vulnerable web interface
Log into router admin interface
Navigate to System Tools > Remote Management
Disable remote management/access
Network Segmentation
allIsolate vulnerable routers from critical network segments
Configure VLANs to separate router management traffic
Implement firewall rules to restrict access to router management interface
🧯 If You Can't Patch
- Replace affected routers with patched or alternative models
- Implement strict network access controls to limit exposure to the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface: System Tools > Firmware UpgradeCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than 16.03.13.11_multi📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/SetIpMacBind with long parameter values
- Unusual process execution or memory errors in system logs
Network Indicators:
- HTTP POST requests to /goform/SetIpMacBind with unusually long 'list' parameter
- Traffic patterns suggesting reverse shell connections from router
SIEM Query:
source="router_logs" AND (uri="/goform/SetIpMacBind" AND content_length>1000)