CVE-2022-29591
📋 TL;DR
CVE-2022-29591 is a buffer overflow vulnerability in the SetNetControlList function of Tenda TX9 Pro routers running firmware version 22.03.02.10. This allows remote attackers to execute arbitrary code on affected devices. Users of Tenda TX9 Pro routers with the vulnerable firmware are affected.
💻 Affected Systems
- Tenda TX9 Pro
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network traffic interception, credential theft, and lateral movement into connected networks.
Likely Case
Router takeover allowing attackers to modify DNS settings, redirect traffic, or deploy malware to connected devices.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. Exploitation appears straightforward based on available information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later firmware versions (check Tenda website for latest)
Vendor Advisory: Not publicly documented by vendor
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to firmware update section. 3. Download latest firmware from Tenda website. 4. Upload and apply firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router management interface
Login to router admin → System Tools → Remote Management → Disable
Network segmentation
allIsolate router management interface to trusted network segments only
🧯 If You Can't Patch
- Replace affected devices with different models or brands
- Implement strict firewall rules blocking all inbound traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade sectionCheck Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
Confirm firmware version is newer than 22.03.02.10 after update📡 Detection & Monitoring
Log Indicators:
- Unusual traffic patterns to router management interface
- Multiple failed login attempts followed by buffer overflow patterns
Network Indicators:
- Unexpected connections to router management ports (typically 80/443)
- Traffic patterns matching known exploit signatures
SIEM Query:
source_ip=external AND dest_port=80 AND dest_ip=router_management AND http_uri CONTAINS 'SetNetControlList'