CVE-2025-65804
📋 TL;DR
This CVE describes a stack overflow vulnerability in Tenda AX3 routers that allows remote attackers to execute arbitrary code by sending specially crafted requests to the formSetIptv endpoint. The vulnerability affects Tenda AX3 router users running vulnerable firmware versions. Attackers can potentially take full control of affected devices.
💻 Affected Systems
- Tenda AX3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent malware, intercept network traffic, pivot to internal networks, or join botnets.
Likely Case
Router compromise leading to network traffic interception, DNS hijacking, credential theft, and lateral movement to connected devices.
If Mitigated
Limited impact with proper network segmentation and firewall rules preventing external access to router management interfaces.
🎯 Exploit Status
The vulnerability is in a web interface endpoint and requires no authentication. Public technical details are available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. Download latest firmware for AX3
3. Log into router admin panel
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Network segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace vulnerable router with different model or manufacturer
- Implement strict firewall rules blocking all external access to router management interface (ports 80/443)
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel under System Status or System ToolsCheck Version:
Login to router web interface and check System Status pageVerify Fix Applied:
Verify firmware version is newer than v16.03.12.11📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/setIptv with large iptvType parameter
- Router crash/reboot logs
- Unusual process execution
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with oversized iptvType parameter
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri="/goform/setIptv" AND content_length>1000)