What this requirement asks
Mark media with necessary CUI markings and distribution limitations.
This is a CMMC Level 2 requirement in the Media Protection family, drawn from NIST SP 800-171 Rev. 2. An assessor evaluates it objective by objective — every objective below must be supported by evidence, not just described in a policy.
Assessment objectives (2)
- 3.8.4[a] — media containing CUI is marked with applicable CUI markings
- 3.8.4[b] — media containing CUI is marked with distribution limitations
What an assessor examines
Examine:
- System media protection policy
- procedures addressing media marking
- physical and environmental protection policy and procedures
- system security plan
- list of system media marking security attributes
- designated controlled areas
- other relevant documents or records
Interview:
- Personnel with system media protection and marking responsibilities
- personnel with information security responsibilities
Test:
- Organizational processes for marking information media
- mechanisms supporting or implementing media marking
Evidence that defends it
Examples of labeling
Check your readiness
Score this requirement against your own environment with the Level 2 self-assessment checklist, or estimate your SPRS score with the free CMMC compliance tool. Self-reported answers are planning signals only — they do not establish a verified or assessor-accepted result.