NIST SP 800-171 Rev 2 · 3.1 Access Control

3.1.1 Authorized access control

Limit system access to authorized users, processes acting on behalf of authorized users, and devices (including other systems).

SPRS weight

5

5 points deducted from 110 when not implemented.

CMMC level

L1 + L2

Level 1 practice AC.L1-3.1.1, from FAR 52.204-21(b)(1)(i)

Assessment objectives

6

From NIST SP 800-171A, each one a “determine if” an assessor answers.

What an assessor checks

NIST SP 800-171A breaks 3.1.1 into 6 objectives. Every one has to be met for the requirement to be met; a partial answer scores as not implemented.

1. [a]Determine if authorized users are identified.
2. [b]Determine if processes acting on behalf of authorized users are identified.
3. [c]Determine if devices (including other systems) authorized to connect to the system are identified.
4. [d]Determine if system access is limited to authorized users.
5. [e]Determine if system access is limited to processes acting on behalf of authorized users.
6. [f]Determine if system access is limited to authorized devices (including other systems).

Examine

[SELECT FROM: Access control policy; procedures addressing account management; security plan; system design documentation; system configuration settings and associated documentation; list of active system accounts and the name of the individual associated with each account; list of conditions for group and role membership; notifications or records of recently transferred, separated, or terminated employees; list of recently disabled system accounts along with the name of the individual associated with each account; access authorization records; account management compliance reviews; system monitoring records; system audit logs and records; other relevant documents or records; list of devices and other systems authorized to connect to organizational systems].

Interview

[SELECT FROM: Personnel with account management responsibilities; system or network administrators; personnel with information security responsibilities].

Test

[SELECT FROM: Organizational processes for managing system accounts; mechanisms for implementing account management].

If it is open: POA&M eligibility

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.

Where 3.1.1 maps

Query it from your own tools

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 3.1.1
get_assessment_objectives 3.1.1
generate_poam_entries ["3.1.1"]

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