What is the expected action regarding access after a reassignment, as per CIP-004 R5.2?

According to CIP-004 R5.2, the requirement is to revoke access for individuals who have been reassigned or whose job responsibilities no longer require access to critical cyber assets by the end of the next calendar day. This is integral to maintaining the security posture of the organization, ensuring that only authorized personnel have access to sensitive systems and data.

Revising access rights promptly after a change in personnel or job duties mitigates the risk of unauthorized access and potential security breaches. A swift revocation process is crucial, as lingering access rights can lead to vulnerabilities within the Critical Infrastructure Protection framework, where inappropriate access can be exploited by malicious actors or lead to inadvertent exposure.

In contrast, other suggested actions—such as providing a grace period or notifying security personnel within a few days—would not adequately enforce the immediate revocation of access needed to ensure cybersecurity integrity. Transferring access to a new account might also create confusion and would not adhere to the established policy of immediate loss of access for those no longer needing it. Thus, the requirement for revocation by the end of the next calendar day reinforces the importance of timely and preventive measures in the realm of cybersecurity.