CVE-2025-57078
📋 TL;DR
A stack overflow vulnerability exists in Tenda G3 routers through the pppoeServerWhiteMacIndex parameter in the formModifyPppAuthWhiteMac function. Attackers can exploit this by sending specially crafted requests to cause a Denial of Service (DoS), potentially crashing the router. This affects Tenda G3 router users running vulnerable firmware versions.
💻 Affected Systems
- Tenda G3 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Router becomes completely unresponsive, requiring physical power cycle or factory reset, disrupting all network connectivity for connected devices.
Likely Case
Router crashes or becomes unstable, causing temporary network outage until device reboots automatically or manually.
If Mitigated
Limited to isolated network segment with no critical services, causing minimal disruption to non-essential devices.
🎯 Exploit Status
Vulnerability details and proof-of-concept are publicly available in GitHub repositories. Exploitation requires sending crafted HTTP requests to the router's web interface.
🛠️ 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 G3 model. 3. Access router web interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable PPPoE authentication white MAC feature
allIf not using PPPoE authentication with MAC filtering, disable this feature to remove attack surface.
Restrict web interface access
allLimit access to router web management interface to trusted IP addresses only.
Configure firewall rules to allow router web interface access only from specific management IPs
🧯 If You Can't Patch
- Segment router onto isolated management network with strict access controls
- Implement network monitoring for abnormal HTTP requests to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status or Firmware Upgrade section.Check Version:
Access router web interface and navigate to system information page, or use: curl http://router-ip/login/AuthVerify Fix Applied:
Verify firmware version has been updated to a version later than v3.0br_V15.11.0.17.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts to web interface
- Router crash/reboot logs
- Unusual HTTP POST requests to formModifyPppAuthWhiteMac endpoint
Network Indicators:
- HTTP requests with unusually long pppoeServerWhiteMacIndex parameter values
- Sudden loss of connectivity to router management interface
SIEM Query:
source="router_logs" AND (uri="/goform/ModifyPppAuthWhiteMac" OR message="crash" OR message="reboot")