CVE-2025-48826
📋 TL;DR
A format string vulnerability in the formPingCmd functionality of Planet WGR-500 routers allows memory corruption via specially crafted HTTP requests. Attackers can exploit this to potentially execute arbitrary code or cause denial of service. This affects Planet WGR-500 routers running firmware version 1.3411b190912.
💻 Affected Systems
- Planet WGR-500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Denial of service causing router instability or crash, potentially allowing credential theft or configuration manipulation.
If Mitigated
Limited impact if device is behind firewall with restricted HTTP access and proper network segmentation.
🎯 Exploit Status
Exploitation requires sending crafted HTTP requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Monitor Planet vendor website for firmware updates
2. Download and verify firmware update
3. Backup current configuration
4. Upload new firmware via web interface
5. Reboot router
6. Restore configuration if needed
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable HTTP/HTTPS management access to prevent exploitation
Access router CLI via SSH/Telnet
Navigate to management settings
Disable web interface
Restrict Management Access
allLimit web interface access to trusted IP addresses only
Configure firewall rules to restrict port 80/443 access
Set up management VLAN
🧯 If You Can't Patch
- Isolate affected routers in separate network segment with strict firewall rules
- Implement network monitoring for suspicious HTTP requests to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface: Login > System > Firmware InformationCheck Version:
ssh admin@router-ip show versionVerify Fix Applied:
Verify firmware version is updated beyond v1.3411b190912📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to /cgi-bin/formPingCmd
- Multiple failed login attempts followed by ping command requests
- Router crash/reboot logs
Network Indicators:
- HTTP POST requests with abnormal format strings in parameters
- Traffic to router management interface from unexpected sources
SIEM Query:
source="router_logs" AND (url="/cgi-bin/formPingCmd" OR message="ping command")