EvidenceSheet
NIST SP 800-171 Rev 3 · 03.04 CM (Configuration Management)

03.04.06 Least Functionality

Configure system to provide only essential capabilities; prohibit or restrict use of specified functions, ports, protocols, software, and services.

Source: NIST SP 800-171 Rev 3, 03.04.06. The statement above is our statement of the clause, read from the published text and cited so you can check it against the official text, not the instrument verbatim. Open NIST SP 800-171 Rev 3 in the compliance library.

3
artefacts
2
held by a system
0
at each review
easy
to go live
Document repository
where the evidence lives
teal = a system already holds it · olive = produced at each review. To go live: easy when half or more of the artefacts are already held by a system, moderate from a quarter to a half, hard below a quarter.

These are the artefacts auditors commonly ask for on this requirement, our guidance rather than text from the standard. Your assessor decides what is sufficient in your context, and asks for samples across the period when a report covers one.

system holds itEvidence a system already holds

  • Port/protocol baselines · Document repository
  • Vulnerability scan output · Vulnerability scanner / patch tooling

periodic reviewEvidence produced at each review

none for this control

governing documentDocuments that govern the control

  • Allowed services list · Document repository

First move

Automate the pull from your Document repository. Version-controlled document with owner, approval and review date as metadata.

Common gaps auditors find

Do this for your whole sheet

Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.

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03.04.05 Access Restrictions for Change · 03.04.08 Authorized Software - Allow by Exception