NIST 800-171 · Access Control
Requirement 3.1.21
- SPRS weight
- SPRS weight: 1
- POA&M eligibility
- POA&M-eligible
- Assessment objectives
- 3 assessment objectives
Official requirement text
Limit use of portable storage devices on external systems.
Assessment objectives
Assessors don’t evaluate the requirement as one sentence; they walk these objectives one by one. Each must be met for the requirement to score.
- 3.1.21[a]use of organizational portable storage devices containing CUI on external systems is identified and documented.
- 3.1.21[b]limits on the use of organizational portable storage devices containing CUI on external systems are defined.
- 3.1.21[c]use of organizational portable storage devices containing CUI on external systems is limited as defined.
Inside Valontir, this requirement carries a full plain-English guide: what it asks in normal words, what good looks like in a small shop, the evidence an assessor accepts, the common gaps that cost points, and a plain reading of every assessment objective shown above. See it in a demo.