Remediation

From Google Cloud CLI

1. Login to Google Cloud console
2. Go to Computer Engine
3. Go to VM instances
4. Click on the Specific VM
5. Click EDIT
6. Unselect Enable connecting to serial ports below Remote access block.
7. Click Save

From Google Cloud Console

Use the below command to disable

        gcloud compute instances add-metadata <INSTANCE_NAME> --zone=<ZONE> --metadata=serial-port-enable=false

or

        gcloud compute instances add-metadata <INSTANCE_NAME> --zone=<ZONE> --metadata=serial-port-enable=0