CVE-2025-69764
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AX3 routers by exploiting a stack-based buffer overflow in the formGetIptv function. Attackers can send specially crafted requests to trigger memory corruption and potentially gain full control of affected devices. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda AX3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router leading to persistent backdoor installation, network traffic interception, lateral movement to connected devices, and botnet recruitment.
Likely Case
Router takeover allowing DNS hijacking, credential theft from network traffic, and use as pivot point for internal network attacks.
If Mitigated
Denial of service or router instability if exploit attempts fail or are blocked by network controls.
🎯 Exploit Status
The vulnerability is in a web interface function and public technical details are available, making exploitation relatively straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
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 panel. 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 vulnerable web interface
Log into router admin > Advanced > System Tools > Remote Management > Disable
Restrict Web Interface Access
allLimit web admin access to specific trusted IP addresses only
Log into router admin > Advanced > Security > Access Control > Add trusted IP ranges
🧯 If You Can't Patch
- Replace the router with a different model that receives security updates
- Place router behind a firewall that blocks all inbound traffic to its management interface
🔍 How to Verify
Check if Vulnerable:
Log into router web interface, navigate to System Status, check firmware version matches v16.03.12.11Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After updating, verify firmware version is higher than v16.03.12.11📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/formGetIptv with long parameter values
- Router crash/reboot logs
- Unusual process creation in router logs
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with oversized stbpvid parameter
- Sudden changes in router configuration
SIEM Query:
source="router_logs" AND (url="/goform/formGetIptv" AND content_length>1000)