CVE-2025-69762
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AX3 routers by exploiting a stack overflow in the formSetIptv function. Attackers can send specially crafted requests to trigger memory corruption and gain control of affected devices. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda AX3 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to install persistent malware, intercept network traffic, pivot to internal networks, and use the device for botnet activities.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and use as a proxy for malicious activities.
If Mitigated
Limited impact if the router is behind a firewall with strict inbound filtering and the vulnerable service is not internet-facing.
🎯 Exploit Status
The references contain technical analysis and likely exploit code. The high CVSS score and remote unauthenticated nature make weaponization probable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available at this time
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for AX3. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the router's web interface
Restrict web interface access
allLimit which IP addresses can access the router admin interface
🧯 If You Can't Patch
- Isolate the router on a separate VLAN with strict firewall rules
- Implement network monitoring for unusual traffic patterns from the router
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status or System ToolsCheck Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
Verify firmware version is no longer v16.03.12.11 after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to formSetIptv endpoint
- Multiple failed login attempts followed by successful formSetIptv access
- Router logs showing unexpected reboots or configuration changes
Network Indicators:
- Unusual outbound connections from router IP
- DNS queries to suspicious domains from router
- Traffic patterns suggesting router is acting as proxy
SIEM Query:
source="router_logs" AND (uri="/goform/formSetIptv" OR message="formSetIptv")