CMMC Practice IA.1.077: Authenticate (or verify) the identities of those users, processes, or devices, as a prerequisite to allowing access to organizational information systems.
CMMC CLARIFICATION (Ref CMMC – Appendix B)
Before you let a person or a device have access to your system, you need to verify that the user or device is who or what it claims to be. This verification is called authentication. The most common way to verify identity is using a username and a hard-to-guess password.Some devices ship with default usernames and passwords. For example, some devices ship so that when you first logon to the device, the username is “admin” and the password is “admin”. When you have devices with this type of default username and password, you need to change the default password to a unique password you create. Default passwords are well known to the public, and easily found in a search. So, these default passwords would be easy for an unauthorized person to guess and use to gain access to your system.