CVE-2026-22550
📋 TL;DR
An OS command injection vulnerability in ELECOM WRC-X1500GS-B and WRC-X1500GSA-B wireless routers allows authenticated attackers to execute arbitrary operating system commands. This affects users who have administrative access to these router models. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- ELECOM WRC-X1500GS-B
- ELECOM WRC-X1500GSA-B
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise leading to network traffic interception, credential theft, lateral movement to connected devices, and persistent backdoor installation.
Likely Case
Router configuration manipulation, DNS hijacking, credential harvesting, and creation of persistent access for attackers.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and minimal exposed attack surface.
🎯 Exploit Status
Exploitation requires authenticated access; command injection is typically straightforward once access is obtained
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware update from vendor
Vendor Advisory: https://www.elecom.co.jp/news/security/20260203-01/
Restart Required: Yes
Instructions:
1. Access router web interface. 2. Navigate to firmware update section. 3. Download latest firmware from ELECOM website. 4. Upload and apply firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit router administrative interface access to specific trusted IP addresses only
Configure firewall rules to restrict access to router management interface (typically ports 80/443)
Strong Authentication Enforcement
allImplement complex passwords and multi-factor authentication if supported
Set strong admin password (minimum 12 characters, mixed case, numbers, symbols)
🧯 If You Can't Patch
- Segment affected routers on isolated network segments
- Implement network monitoring for unusual outbound connections from routers
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface; if not running latest firmware from ELECOM advisory, assume vulnerableCheck Version:
Access router web interface → System Information → Firmware VersionVerify Fix Applied:
Verify firmware version matches latest version listed in ELECOM security advisory📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in router logs
- Multiple failed login attempts followed by successful login
- Configuration changes from unexpected sources
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Unexpected port scans originating from router
SIEM Query:
source="router_logs" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")