You can use the username "root" with it's default password to login and change the "admin" password.
Refer the doc for the default password of user "root"
Using the console-based root account you can elevate yourself into the existing admin CLI using "su - admin" from the root console prompt. From there, create a new admin user account and assign it to the admin group. Do NOT assign a password. Exit from root and use NEW admin user account to log in to the CLI. Edit / change the existing admin user password. Exit from this NEW admin user account and test the new credentials for the existing admin account. Once confirmed, DELETE the NEW admin user account.
The default ROOT password should be changed for security purposes in any production level environment, even with access to root restricted to local console access only.
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