Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded ECDSA SSH key for the root account.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15313
Reference (s):
- https://pierrekim.github.io/blog/2020-03-09-zyxel-secumanager-0day-vulnerabilities.html
- https://www.zyxel.com/support/vulnerabilities-of-CloudCNM-SecuManager.shtml