Hi Piyush,
xxxxxxx login:admin
password:**********
# scope security
/security # show local-user
User Name First Name Last name
--------------- --------------- ---------
admin
/security # enter local-user admin
/security/local-user # set password
Enter a password: *********
Confirm the password: **********
/security/local-user* # commit-buffer
Once the password is changed, confirm that it works properly.
I hope this statement will helpful for you.