EvidenceSheet
NIST SP 800-171 Rev 3 · 03.01 AC (Access Control)

03.01.20 Use of External Systems

Establish terms and conditions for use of external systems; restrict use of organizationally controlled storage devices on external systems.

Source: NIST SP 800-171 Rev 3, 03.01.20. 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
1
held by a system
0
at each review
moderate
to go live
Data governance / DLP tooling
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

  • DLP rules on removable media · Data governance / DLP tooling

periodic reviewEvidence produced at each review

none for this control

governing documentDocuments that govern the control

  • Acceptable use policy · Policy repository / GRC workspace
  • Third-party connection agreements · Vendor register / contract repository

First move

Start with the 1 of 3 artefacts that already live in a system (Data governance / DLP tooling); keep the periodic reviews but log each one as a dated record with a named reviewer.

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.

Build my evidence sheet

03.01.18 Access Control for Mobile Devices · 03.01.22 Publicly Accessible Content