CPN Numbers are legal CPN Number is real (Say good bye to credit rejections and debt collections) Have you been worried about ID theft, someone stealing your Social Security number (SSN) or fraud? Have you been looking for an easy fix for bad credit? In the process of your research, you might have heard of a CPN, or Credit Privacy Number.A credit privacy number, or CPN is an ID number that can be used instead of using your Social Security number