Certain PTZOptics and possibly other ValueHD-based cameras have SSH or telnet or both enabled by default. Operating system users with administrative privileges (including the root user) have default passwords that are trivial to crack. The passwords cannot be changed by the user, nor can the SSH or telnet service be disabled by the user.
https://www.cisa.gov/news-events/ics-advisories/icsa-25-162-10