Understanding Controlled Unclassified Information (CUI) is essential for companies entering the DoD supply chain. But because CUI guidance comes from multiple sources, organizations often struggle to understand what actually applies to them. Layer 8 Security helps cut through that noise.

Two Key Parts of the CUI Landscape

1. Government-Wide CUI Registry (NARA, 32 CFR 2002)This covers allfederal CUI categories. It’s broad, foundational, and often more than most organizations need.
2. DoD-Specific Requirements (DFARS & CMMC certification)DoD contractors should reference DOD 5200.48 and must follow DFARS 7012 -7020 and now 7021, the “new” CMMC requirements for protecting CUI. These rules are narrower and are the core of the language governing CUI present in DoD contracts.

Because these two systems overlap, organizations often receive mixed or overly broad guidance.

Focus on the CUI That Actually Applies

For companies working strictly with DoD contracts, the scope is much smaller. You are contractually obligated to protect CUI that originates from or is created for DoD work.

Why CUI Shows Up in DoD Invoices

Many organizations unintentionally include CUI in invoices. With basic training, this is entirely preventable. Common examples include:

• Controlled Technical Information (CTI)

Line items or attachments describing configuration data, part numbers, system specs, drawings, or software deliverables.

• Procurement/Acquisition Data

Rates, Fees, and profit margins can be CUI, specifically in an environment where the cost itself is competition sensitive or associated with controlled technology.

• Export Control Information

ECCNs (Export Control Classification Numbers) can be CUI and have shown up in invoices. Also, overly specific  line items – “Development services for ITAR-controlled targeting module.

• PII

All forms of PII associated with a DoD contract will potentially fall into the CUI category, this can include banking and tax info.

• Critical Infrastructure/Security Info

Financial schedules or quantities revealing system capabilities or readiness. Another case of just putting too much data in an invoice.

What Our Experts Say

• Keep your CUI scope tied to the actual DoD contract.
• Store and send sensitive files only within CMMC-compliant systems.
• Train teams to avoid unnecessary technical or sensitive detail in invoices.
• Confirm with the DoD or prime contractor when in doubt.

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