Back when I was a Sysadmin, I ran into this situation quite frequently at various companies I worked for. I naturally always changed the default username and password to something else, but sometimes, local users were really pissed at me for doing so. Even though I stopped being a system administrator in 2011, I’m fairly sure that a lot of businesses have devices that still have those default credentials active.
Got a router or another device that has “Admin” and “Password” set as the default password? Do yourself a favor and change them.