​Unmarked Controlled Unclassified Information (CUI) is one of the most common and most overlooked - risks in CMMC Level 2 readiness. Many organizations fail audits not because CUI is absent, but because it was never properly identified, classified, or documented.

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This practical guide helps defense contractors, IT leaders, and compliance teams quickly recognize potential unmarked CUI using real-world indicators such as distribution statements, legacy sensitivity labels, and contractual obligations. By following a clear, repeatable approach, your organization can strengthen compliance, improve audit readiness, and confidently align with CMMC Level 2 requirements.