NIST SP 800-171 Rev 2 · 3.1 Access Control

3.1.2 Transaction and function control

Limit system access to the types of transactions and functions that authorized users are permitted to execute.

SPRS weight: 5; 5 points deducted from 110 when not implemented.
CMMC level: L1 + L2; Level 1 practice AC.L1-3.1.2, from FAR 52.204-21(b)(1)(ii)
Assessment objectives: 2; From NIST SP 800-171A, each one a “determine if” an assessor answers.

What an assessor checks

NIST SP 800-171A breaks 3.1.2 into 2 objectives. Every one has to be met for the requirement to be met; a partial answer scores as not implemented.

[a]Determine if the types of transactions and functions that authorized users are permitted to execute are defined
[b]Determine if system access is limited to the defined types of transactions and functions for authorized users.

Examine: [SELECT FROM: Access control policy; procedures addressing access enforcement; security plan; system design documentation; list of approved authorizations (user privileges) including remote access authorizations; system configuration settings and associated documentation; system audit logs and records; other relevant documents or records].
Interview: [SELECT FROM: Personnel with access enforcement responsibilities; system or network administrators; personnel with information security responsibilities; system developers].
Test: [SELECT FROM: Mechanisms implementing access control policy].

Not POA&M-eligible: above the 1-point ceiling · 5 points deducted

Worth 5 points. No requirement over 1 point may appear on a Level 2 POA&M, so this has to be closed before the assessment.

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 3.1.2
get_assessment_objectives 3.1.2
generate_poam_entries ["3.1.2"]

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