NIST 800-171 Revision 3, Family Control "Physical Protection" safeguards Controlled Unclassified Information (CUI) by restricting physical access to facilities and hardware. It mandates physical security measures like access control systems, visitor logs, and secure storage of equipment and media. These measures prevent unauthorized access, tampering, and theft, ensuring CUI confidentiality and integrity.

ITAR Related: Requires that physical access to areas where controlled technical data is stored is restricted. PE controls, such as access badges and surveillance systems, help prevent unauthorized physical access to sensitive information.

CMMC 2.0 Level 1:

(viii) Limit physical access to organizational information systems, equipment, and the respective operating environments to authorized individuals.

(ix) Escort visitors and monitor visitor activity; maintain audit logs of physical access; and control and manage physical access devices.