CVE-2017-18371: Billion 5200w-T Firmware

Critical severity, CVSS 9.8. EPSS: 22.5% chance of exploitation in the next 30 days.

The ZyXEL P660HN-T1A v2 TCLinux Fw #7.3.37.6 router distributed by TrueOnline has three user accounts with default passwords, including two hardcoded service accounts: one with the username true and password true, and another with the username supervisor and password zyad1234. These accounts can be used to login to the web interface, exploit authenticated command injections, and change router settings for malicious purposes.

Affected products

• Billion 5200w-T Firmware: version 7.3.8.0 only
• Zyxel P660HN-T1A v1 Firmware: version 7.3.37.6 only
• Zyxel P660HN-T1A v2 Firmware: version 7.3.37.6 only

Published 2019-05-02. Last modified 2026-06-17.