AC.L2-3.1.10 — Lock idle sessions with pattern-hiding displays
Use session lock with pattern-hiding displays to prevent access and viewing of data after a period of inactivity.
Verbatim NIST SP 800-171 Rev 2 requirement text (3.1.10).
How it's scored
1 point deducted from your SPRS score if unmet.
An open gap here may sit on a POA&M at conditional Level 2 certification (32 CFR 170.21), provided your total score is at least 88 of 110 — and it must close within 180 days of the conditional status date.
What an assessor checks: the 3 assessment objectives
NIST SP 800-171A determination statements, verbatim. A CMMC Level 2 assessor marks AC.L2-3.1.10 MET only when every applicable objective is satisfied — and examines evidence, not assertions.
| Objective | Determination statement |
|---|---|
| 3.1.10[a] | the period of inactivity after which the system initiates a session lock is defined. |
| 3.1.10[b] | access to the system and viewing of data is prevented by initiating a session lock after the defined period of inactivity. |
| 3.1.10[c] | previously visible information is concealed via a pattern-hiding display after the defined period of inactivity. |
Where do you stand on AC.L2-3.1.10?
The free Muster Score walks all 110 requirements — including every objective above — and computes your exact SPRS score in your browser. No signup, no upload, and your answers never leave your device.
Get your free Muster Score →Requirement and objective text: NIST SP 800-171 Rev 2 / SP 800-171A (verbatim). Scoring: DoD Assessment Methodology v1.2.1; POA&M eligibility: 32 CFR 170.21. Muster is independent and not affiliated with the U.S. Department of Defense or the Cyber AB; this page is compliance information, not legal advice or a certification.