CVE-2025-57063
📋 TL;DR
This vulnerability in Tenda G3 routers allows attackers to cause a Denial of Service (DoS) by sending specially crafted requests that trigger a stack overflow in the port mapping functionality. The vulnerability affects Tenda G3 routers running firmware version 3.0br_V15.11.0.17, potentially disrupting network connectivity for affected devices.
💻 Affected Systems
- Tenda G3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, persistent network downtime, and potential remote code execution if the overflow can be controlled to execute arbitrary code.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality, causing temporary network disruption for connected devices.
If Mitigated
Minimal impact if the router is behind a firewall with restricted access to its management interface.
🎯 Exploit Status
The vulnerability is in a web interface function and requires sending a crafted HTTP request to the router's management interface. The provided GitHub references contain technical details about the overflow.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check Tenda's official website for firmware updates. 2. If an update is available, download the firmware file. 3. Log into the router's web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Wait for the router to reboot automatically.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web management interface
Restrict Management Interface Access
allUse firewall rules to limit access to the router's management interface to trusted IP addresses only
🧯 If You Can't Patch
- Isolate the router on a separate network segment with strict access controls
- Implement network monitoring to detect exploitation attempts targeting the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check the router's firmware version in the web interface under System Status or System Tools > Firmware Upgrade. If the version is exactly 3.0br_V15.11.0.17, the device is vulnerable.Check Version:
Connect to router web interface and navigate to System Status page, or use curl: curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After updating firmware, verify the version has changed from 3.0br_V15.11.0.17 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Multiple failed HTTP POST requests to /goform/delPortMapping
- Router crash/reboot events in system logs
- Unusual port mapping deletion attempts
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with malformed portMappingIndex parameter
- Sudden loss of connectivity to router management interface
SIEM Query:
source="router_logs" AND (url="/goform/delPortMapping" OR message="portMappingIndex") AND status=200