CVE-2024-33365
📋 TL;DR
A buffer overflow vulnerability in Tenda AC10 routers allows remote attackers to execute arbitrary code via the Virtual_Data_Check function in the httpd component. This affects Tenda AC10 v4 routers running firmware version US_AC10V4.0si_V16.03.10.20_cn. Attackers can potentially gain full control of affected devices.
💻 Affected Systems
- Tenda AC10 v4
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, network pivoting, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device for DDoS attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public proof-of-concept available in GitHub repositories; exploitation requires sending crafted requests to the httpd service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
Check Tenda's official website or support channels for firmware updates. If available, download the latest firmware and apply via the router's web interface.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's management interface.
Access router web interface > Advanced > System Tools > Remote Management > Disable
Network Segmentation
allIsolate router management interface to trusted network segments only.
Configure firewall rules to restrict access to router IP on port 80/443 to trusted IPs only
🧯 If You Can't Patch
- Replace affected devices with patched or alternative router models
- Implement strict network access controls and monitor for suspicious traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: Login > Advanced > System Tools > Firmware UpgradeCheck Version:
Check router web interface or use nmap to identify service bannersVerify Fix Applied:
Verify firmware version has been updated to a version newer than US_AC10V4.0si_V16.03.10.20_cn📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to router management interface
- Multiple failed login attempts followed by buffer overflow patterns
Network Indicators:
- Unexpected outbound connections from router
- Traffic patterns suggesting command and control communication
SIEM Query:
source_ip="router_ip" AND (http_request CONTAINS "Virtual_Data_Check" OR http_status=500)