CVE-2025-12225
📋 TL;DR
This vulnerability in Tenda AC6 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the WifiGuestSet HTTP handler. Attackers can exploit this by sending specially crafted HTTP requests to manipulate the shareSpeed parameter. All users running the affected firmware version are at risk.
💻 Affected Systems
- Tenda AC6
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and potential lateral movement to connected devices.
Likely Case
Router takeover allowing traffic interception, DNS manipulation, credential theft, and deployment of persistent malware.
If Mitigated
Limited impact if device is behind firewall with restricted HTTP access or if exploit attempts are blocked by network security controls.
🎯 Exploit Status
Public proof-of-concept exists on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Guest WiFi
allDisable the guest WiFi feature to remove the vulnerable endpoint
Restrict HTTP Access
linuxBlock external access to router admin interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate affected routers in separate network segments with strict firewall rules
- Implement network monitoring for exploit attempts and block malicious IPs
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade sectionCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has been updated to a version newer than 15.03.06.50📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/WifiGuestSet with abnormal shareSpeed parameter values
- Router crash or reboot logs
Network Indicators:
- Unusual HTTP traffic to router admin interface on port 80/443
- POST requests with long strings in shareSpeed parameter
SIEM Query:
source="router_logs" AND uri="/goform/WifiGuestSet" AND (param="shareSpeed" AND length(value)>100)