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.
Use CWE-798, Billion vendor hub and 5200w-T Firmware product page to widen CVE-2017-18371 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2017-18368, CVE-2017-18369 and CVE-2017-18374 for nearby disclosures in the same product family.