I'll do better than a second case, here's three: Barracuda Networks: https://krebsonsecurity.com/2013/01/backdoors-found-in-barracuda-networks-gear/ https://kr

I'll do better than a second case, here's three: Barracuda Networks: https://krebsonsecurity.com/2013/01/backdoors-found-in-barracuda-networks-gear/ https://krebsonsecurity.com/2013/01/backdoors-found-in-barra... Fortinet: https://community.spiceworks.com/t/hard-coded-password-backdoor-found-in-fortinet-firewalls/464379 https://community.spiceworks.com/t/hard-coded-password-backd... Korenix: https://sec-consult.com/vulnerability-lab/advisory/backdoor-account-in-korenix-technology-jetport-series/ https://sec-consult.com/vulnerability-lab/advisory/backdoor-... The fact that the password is "rzadmin" makes it a lot more likely that this is just run of the mill stupidity, and not something more nefarious: you'd want a backdoor that isn't blindingly obvious and usable by the CIA.