ip ssh permit-empty-password
By default, empty password logins are not allowed.
Global configuration mode
The
no form of the command disallows user to log in without being prompted for a password.
By default, empty password logins are not allowed; users with an SSH client are always prompted for a password when they log in to the device. To gain access to the device, each user must have a username and password. Without a username and password, a user is not granted access.
If you enable empty password logins, users are not prompted for a password when they log in. Any user with an SSH client can log in without being prompted for a password.