said by NetFixer:
Of course, if the Linksys router(s) in question have a default backdoor password, that might not help.
I know it's a Linux environment but do I recall logging in can use a (BLANK) or any username? Or do you have to sign in with user "root"? I vaguely recall, like other Linksys routers, they may have hacked in that compatibility. It's just that kind of change that can open a vulnerability if it's done wrong.