CVE-2026-24449
📋 TL;DR
This vulnerability allows attackers to calculate initial administrative passwords for affected ELECOM wireless routers using publicly available system information. Attackers can gain unauthorized administrative access to router configuration interfaces. This affects users of WRC-X1500GS-B and WRC-X1500GSA-B routers who haven't changed default credentials.
💻 Affected Systems
- ELECOM WRC-X1500GS-B
- ELECOM WRC-X1500GSA-B
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise allowing network traffic interception, DNS hijacking, credential theft, and deployment of persistent malware on connected devices.
Likely Case
Unauthorized administrative access to router leading to network configuration changes, internet service disruption, and potential credential harvesting.
If Mitigated
Limited impact if strong unique passwords are already configured and remote administration is disabled.
🎯 Exploit Status
Exploitation requires only system information that may be publicly accessible or obtainable through network scanning.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware update as referenced in vendor advisory
Vendor Advisory: https://www.elecom.co.jp/news/security/20260203-01/
Restart Required: Yes
Instructions:
1. Access router admin interface. 2. Navigate to firmware update section. 3. Download latest firmware from ELECOM website. 4. Upload and apply firmware update. 5. Reboot router.
🔧 Temporary Workarounds
Change administrative password
allImmediately change the router's administrative password to a strong, unique password not based on system information.
Disable remote administration
allDisable remote administration features to prevent external exploitation attempts.
🧯 If You Can't Patch
- Change administrative password immediately to strong unique password
- Disable remote administration and restrict management interface to trusted IPs only
🔍 How to Verify
Check if Vulnerable:
Check if router model is WRC-X1500GS-B or WRC-X1500GSA-B and if administrative password hasn't been changed from default.Check Version:
Check router admin interface for firmware version informationVerify Fix Applied:
Verify firmware version is updated to latest version from ELECOM and test that password cannot be calculated from system information.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login
- Administrative configuration changes from unexpected sources
Network Indicators:
- Unusual traffic patterns from router
- DNS configuration changes
- Port scans targeting router management interface
SIEM Query:
source_ip="router_ip" AND (event_type="authentication" AND result="success") AND user="admin"