CVE-2025-54399
📋 TL;DR
Multiple stack-based buffer overflow vulnerabilities in Planet WGR-500 routers allow remote code execution via specially crafted HTTP requests. Attackers can exploit the formPingCmd functionality by manipulating the ipaddr parameter to execute arbitrary commands. This affects Planet WGR-500 routers running vulnerable firmware.
💻 Affected Systems
- Planet WGR-500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to complete router takeover, network traffic interception, lateral movement to connected devices, and persistent backdoor installation.
Likely Case
Remote code execution with router administrative privileges, enabling network reconnaissance, traffic manipulation, and denial of service attacks.
If Mitigated
Limited impact with proper network segmentation and firewall rules preventing external access to router management interface.
🎯 Exploit Status
The vulnerability requires sending crafted HTTP requests to the router's web interface. No authentication is required, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Planet website for firmware updates. 2. Download latest firmware. 3. Access router web interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable web management interface
linuxDisable HTTP/HTTPS management access to prevent exploitation
Access router CLI via SSH/Telnet
Disable web interface service
Network segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to block external access to router management ports (80, 443, 8080)
🧯 If You Can't Patch
- Implement strict network access controls to router management interface
- Monitor for unusual HTTP requests to router web interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or SSH. If version is v1.3411b190912, the device is vulnerable.Check Version:
ssh admin@router-ip 'cat /etc/version' or check web interface System Status pageVerify Fix Applied:
Verify firmware version has been updated to a version later than v1.3411b190912📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to formPingCmd endpoint
- Multiple ping commands with abnormal parameters
- Failed authentication attempts to router web interface
Network Indicators:
- HTTP requests with long ipaddr parameters
- Traffic to router management ports from unexpected sources
- Unusual outbound connections from router
SIEM Query:
source="router-logs" AND (url="*formPingCmd*" AND (param="*ipaddr*" AND length>100))