ACSC Essential Eight covers 18.6% of NIST SP 800-171 Rev 3
18 of the 97 controls in NIST SP 800-171 Rev 3 are already satisfied by evidence you collected for ACSC Essential Eight. 79 are genuine gaps. Every claim below was judged against both control sets and then argued against; the ones that did not survive are published further down with the reason each failed.
This number is directional. It says how much of NIST SP 800-171 Rev 3 your ACSC Essential Eight evidence satisfies. The reverse pair is a different number, often very different, because a security standard has enormous depth for access control and almost none for lawful basis or data subject rights.
46 candidate mappings were examined and 0 were removed. Signed off 2026-08-19, review level machine verified. Mappings were judged by Claude Code rather than read line by line by a practitioner. Every claim shows its reasoning so you can check it. Ask and a practitioner will review this pair.
Where the gaps are
Coverage is never evenly spread. A source standard usually satisfies one part of a target almost completely and barely touches another, and which part is which is the thing worth knowing before you plan the work.
Theme level, not control level, deliberately. The per-control list of what is evidenced and what is a gap is the report itself, so publishing it here would be publishing the thing being sold.
Claims that held
A sample. Each one names the control whose evidence does the work, the control it satisfies, and why.
Privileged access for users and services is limited to only what their duties require.
Privileged access is revalidated at 12 months and removed after 45 days of inactivity.
Privileged accounts are held by designated users and used solely for privileged duties.
Privileged access events are centrally logged.
Unprivileged user accounts cannot log on to privileged operating environments.
PowerShell module, script block and transcription logging is generated and centrally collected.
Allowed and blocked application control events are generated and centrally logged.
Event logs from servers and workstations are analysed in a timely manner to detect events.
Claims that did not hold
Nothing proposed for this pair was rejected in review. That is unusual and worth knowing rather than hiding: it means the candidate set was small and every candidate held.
The full report
Everything above is a sample. The report is every evidenced control and every gap, with the reasoning and the source document behind each one, in a form you can hand to an assessor. $299, emailed immediately.
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