Security frameworks
NIST SP 800-171
NIST · Global / US
Protecting Controlled Unclassified Information (CUI) in non-federal systems.
Issuer
NIST
Applies in
Global / US
Category
Security frameworks
The practitioner view
Working with NIST SP 800-171
What NIST SP 800-171 is
Protecting Controlled Unclassified Information (CUI) in non-federal systems. It is issued by NIST and applies across Global / US. Our assessors work against it directly, so what follows is the practitioner view rather than a restatement of the text.
Who it binds
Applicability turns on what you process and who regulates you, not on your size. If NIST sets your rules, or a customer contract names NIST SP 800-171, you are in scope. We map that boundary first, because an over-drawn scope is the single most expensive mistake in any programme.
What an assessor looks for
Evidence that the control operated, not that it was written down. Expect sampling across the period, interviews with the control owners, and a request for the artefacts that prove the control ran on the days it was supposed to. Policies without operating evidence are the most common finding we raise.
How to get ready
Scope it, assess the gap against the current version, remediate in priority order, then collect evidence continuously rather than in the fortnight before the audit. Evidence lag is what slips dates, not the controls themselves.
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Need NIST SP 800-171 applied to your environment?
A senior, CERT-In empanelled assessor will map the applicable controls, tell you what evidence satisfies them, and size the remediation honestly.
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