CVE-2023-51961
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AX1803 routers by exploiting a stack overflow in the formGetIptv function. Attackers can send specially crafted requests to the adv.iptv.stballvlans parameter to gain full control of affected devices. This affects all users running vulnerable firmware versions.
💻 Affected Systems
- Tenda AX1803
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover 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 device is behind firewall with restricted WAN access, though internal network attacks remain possible.
🎯 Exploit Status
Public technical details available showing exploitation method. No authentication required to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. Download latest firmware for AX1803
3. Access router web interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to web management interface
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace affected devices with patched alternatives
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or via SSH/Telnet if enabledCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than v1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formGetIptv
- Multiple failed buffer overflow attempts
- Sudden configuration changes
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (uri="/goform/formGetIptv" OR message="adv.iptv.stballvlans")