Don’t worry, if you have forgotten, changed or lost the CVM password and are not able to access the CLI you can recover/reset your CVM “nutanix” password but you still need the prism user & password credentials
Simply put, by setting up passwordless ssh and generating ssh keys from your workstation and adding your public key to the cluster via the prism you can regain access to the CVM via SSH
Once complete, you can login to the CVM from the same workstation and will not be prompted to enter the password but will log you in directly
Follow this article on how accomplis: KB-1895
Good luck & Don’t forget to change your password again to somthing you can remember!