CVE-2025-50528
📋 TL;DR
A buffer overflow vulnerability in Tenda AC6 routers allows attackers to execute arbitrary code or crash the device by sending specially crafted requests to the fromNatStaticSetting function via the page parameter. This affects all users running vulnerable firmware versions. 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 into connected networks.
Likely Case
Router crash causing denial of service, potentially requiring physical reset and disrupting network connectivity for all connected devices.
If Mitigated
Limited impact with proper network segmentation and firewall rules preventing external access to router management interface.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository. Exploitation requires sending crafted HTTP request to vulnerable endpoint.
🛠️ 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 System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router after installation
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace vulnerable router with different model or vendor
- Implement strict firewall rules blocking all external access to router management ports (typically 80, 443, 8080)
🔍 How to Verify
Check if Vulnerable:
Access router web interface, navigate to System Status or About page, check firmware version against affected range.Check Version:
curl -s http://router-ip/ | grep -i firmware || wget -qO- http://router-ip/goform/getStatusVerify Fix Applied:
After firmware update, verify version is newer than V15.03.05.19 and test if vulnerable endpoint still responds to crafted requests.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/fromNatStaticSetting
- Router crash/reboot events
- Multiple failed login attempts followed by buffer overflow patterns
Network Indicators:
- HTTP requests with unusually long page parameter values
- Traffic to router management interface from unexpected sources
SIEM Query:
source="router_logs" AND (uri="/goform/fromNatStaticSetting" OR message="buffer overflow" OR message="segmentation fault")