Node A6 · Acronym decoder
CUI
Controlled Unclassified Information
What it actually means
Government information that isn't classified but still legally requires safeguarding — export-controlled technical data, procurement-sensitive information, privacy data, and dozens of other categories consolidated under one regime. For contractors, holding CUI is what triggers the NIST 800-171 / CMMC compliance chain.
Where you'll meet it
Document markings, contract clauses, and cybersecurity compliance scoping.