NIST SP 800-171 Rev 2 · 3.1 Access Control

3.1.10 Session lock

Use session lock with pattern-hiding displays to prevent access and viewing of data after a period of inactivity.

SPRS weight: 1; 1 point deducted from 110 when not implemented.
CMMC level: L2; Level 2 only; not among the 17 Level 1 practices.
Assessment objectives: 3; From NIST SP 800-171A, each one a “determine if” an assessor answers.

What an assessor checks

NIST SP 800-171A breaks 3.1.10 into 3 objectives. Every one has to be met for the requirement to be met; a partial answer scores as not implemented.

[a]Determine if the period of inactivity after which the system initiates a session lock is defined.
[b]Determine if access to the system and viewing of data is prevented by initiating a session lock after the defined period of inactivity.
[c]Determine if previously visible information is concealed via a pattern-hiding display after the defined period of inactivity.

Examine: [SELECT FROM: Access control policy; procedures addressing session lock; procedures addressing identification and authentication; system design documentation; system configuration settings and associated documentation; security plan; other relevant documents or records].
Interview: [SELECT FROM: System or network administrators; personnel with information security responsibilities; system developers].
Test: [SELECT FROM: Mechanisms implementing access control policy for session lock].

May be carried on a Level 2 POA&M · 1 point deducted

A 1-point requirement outside the six named exclusions - eligible to carry, and NOT MET until a closeout assessment confirms it.

A POA&M is only permitted at a score of 88 or above, and closes in one 180-day window. Check a full gap list or compute your score.

No direct mapping.

This page and the MacTech CMMC MCP server render the same dataset. Ask your assistant and it will answer from the methodology, not from memory.

lookup_control 3.1.10
get_assessment_objectives 3.1.10
generate_poam_entries ["3.1.10"]

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