NIST Releases Enhanced Security Requirements for CUI Protection

• •NIST's SP 800-172r3 outlines enhanced security requirements for CUI protection.
• •The guidelines are designed to mitigate risks from advanced persistent threats (APTs).
• •Federal agencies can tailor security requirements based on their specific needs.

On May 18, 2026, NIST published SP 800-172r3, detailing enhanced security requirements for protecting Controlled Unclassified Information (CUI) in nonfederal systems. This publication aims to bolster the confidentiality, integrity, and availability of CUI, particularly against advanced persistent threats (APTs). It serves as a supplement to SP 800-171, providing federal agencies with a framework to manage risks associated with CUI. The guidelines are applicable to nonfederal systems that process, store, or transmit CUI, focusing on critical programs or high-value assets. Agencies are encouraged to select security requirements based on their specific mission needs and risk assessments. The publication emphasizes the importance of protecting CUI to ensure the federal government's operational capabilities. The document is available in multiple formats, with the PDF being the authoritative source.