CVE-2025-53842
📋 TL;DR
This CVE describes a use of hard-coded credentials vulnerability in ZWX-2000CSW2-HN and ZWX-2000CS2-HN firmware. Attackers can exploit this to obtain device credentials and tamper with settings. This affects ZWX-2000CSW2-HN devices prior to version 0.3.19 and all versions of ZWX-2000CS2-HN.
💻 Affected Systems
- ZWX-2000CSW2-HN
- ZWX-2000CS2-HN
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing configuration changes, service disruption, and potential lateral movement within the network.
Likely Case
Unauthorized access to device settings leading to configuration changes, service disruption, or data manipulation.
If Mitigated
Limited impact if devices are isolated, monitored, and access controls are properly implemented.
🎯 Exploit Status
Hard-coded credential vulnerabilities typically have low exploitation complexity once credentials are discovered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: ZWX-2000CSW2-HN: 0.3.19 or later
Vendor Advisory: https://zexelon.co.jp/pdf/jvn44419726.pdf
Restart Required: Yes
Instructions:
1. Download firmware version 0.3.19 or later from vendor. 2. Follow vendor's firmware update procedure. 3. Reboot device after update. 4. Verify firmware version post-update.
🔧 Temporary Workarounds
Network segmentation
allIsolate affected devices from untrusted networks and internet access
Access control restrictions
allImplement strict firewall rules and network access controls
🧯 If You Can't Patch
- Segment devices on isolated VLANs with strict access controls
- Implement network monitoring and alerting for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version via device web interface or CLI. For ZWX-2000CSW2-HN, verify version is below 0.3.19. For ZWX-2000CS2-HN, all versions are vulnerable.Check Version:
Check via device web interface or vendor-specific CLI commandsVerify Fix Applied:
After patching, confirm firmware version is 0.3.19 or later for ZWX-2000CSW2-HN. For ZWX-2000CS2-HN, contact vendor for updated firmware availability.📡 Detection & Monitoring
Log Indicators:
- Unauthorized login attempts
- Configuration changes from unknown sources
- Authentication failures followed by successful logins
Network Indicators:
- Unexpected connections to device management ports
- Traffic patterns indicating configuration changes
SIEM Query:
source="device_logs" AND (event_type="authentication" AND result="success" AND user="default_admin") OR (event_type="configuration_change" AND user NOT IN ["authorized_users"])