“Controlled Unclassified Information,” or CUI, is one of the most important concepts in CMMC—and one of the most misunderstood concepts.
CUI is not classified information, but it is still sensitive and requires safeguarding under U.S. government rules.
In simple terms, CUI is information the government cares about protecting, even though it doesn’t rise to the level of classified data.
For Department of War contractors, CUI often includes things like:
- Technical drawings and specifications
- Engineering data
- Export-controlled information
- Controlled defense information (CDI)
- Certain contract, operational, or logistics data
What makes information “CUI” isn’t how secret it feels—it’s how it’s designated and handled.
If your contract, data markings, or flow-down requirements say the information is CUI, then it must be protected according to NIST SP 800-171, and verified through CMMC Level 2.
One of the biggest mistakes organizations make is assuming CUI only lives in obvious places. In reality, it can exist in emails, shared folders, collaboration tools, backups, and even personal notes—anywhere it’s stored, processed, or transmitted.
That’s why identifying CUI is not just a compliance exercise. It’s a business and operational decision that affects:
- Scope of assessment
- System architecture
- User access
- Training requirements
- Ongoing compliance costs
CUI also drives everything else in CMMC. If you don’t know what your CUI is, you can’t confidently define scope, build an enclave, or demonstrate compliance during an assessment.
At the end of the day, protecting CUI isn’t about over-securing everything. It’s about understanding your data, respecting its importance, and applying the right controls in the right places.
For DoD contractors, that understanding is no longer optional—it’s foundational, and StrategicIT Solutions LLC can help you with that.
Let’s jump on a call and talk CUI and CMMC: https://calendly.com/strategicit/cmmc-discovery-call