CVE-2025-50262
📋 TL;DR
This buffer overflow vulnerability in Tenda AC6 routers allows attackers to execute arbitrary code or crash the device by sending specially crafted requests to the formSetQosBand function. It affects users running vulnerable firmware versions on Tenda AC6 routers. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- Tenda AC6
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network traffic interception, and lateral movement to internal networks.
Likely Case
Router crash causing denial of service, requiring physical reset and disrupting network connectivity for all connected devices.
If Mitigated
Limited to denial of service if exploit fails to achieve code execution, still requiring router reboot.
🎯 Exploit Status
Exploit requires access to router web interface; authentication status unclear from available information. Public proof-of-concept exists in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda official website for firmware updates
2. Download latest firmware for AC6 model
3. Access router web interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Wait for router to reboot
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Restrict management interface access
allLimit web interface access to specific trusted IP addresses
🧯 If You Can't Patch
- Segment network to isolate router management interface
- Implement strict firewall rules to block unnecessary traffic to router
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status or About pageCheck Version:
No CLI command; check via web interface at 192.168.0.1 or router's IP addressVerify Fix Applied:
Verify firmware version has been updated to a version newer than v15.03.05.16_multi📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts
- Unusual POST requests to formSetQosBand endpoint
- Router crash/reboot events
Network Indicators:
- Unusual traffic patterns to router management interface
- Large payloads sent to formSetQosBand endpoint
SIEM Query:
source="router_logs" AND (uri="/goform/setQosBand" OR message="buffer overflow" OR message="crash")