I agree , this is not a backdoor in the more commonly understood sense of the term , post-Snowden.

At the same time, your suggested "right title" doesn't seem too accurate either (imo).

When I see the term backdoor, I think of something done intentionally.

Maybe something like: Embeded unsecured credentials , allow attacker remote root ssh access

( it's actually much harder than I initially thought , to phrase)