Does NIST SP 800-171 cover CMMC 2.0 Level 1?

76% of CMMC 2.0 Level 1 you already have

NIST SP 800-171 already covers about 76% of CMMC 2.0 Level 1, leaving 4 of 17 controls as genuinely new work.

Already covered 0 Likely covered 13 New work 4

No control in NIST SP 800-171 maps directly to one in CMMC 2.0 Level 1. Everything counted as covered is covered because both map to the same third standard, which is what a crosswalk is, but it is an inference rather than a lookup.

What is genuinely new work

Nothing in NIST SP 800-171 reaches these. This is the list to scope.

AC.L1-3.1.1

Authorized Access Control

AC.L1-3.1.2

Transaction and Function Control

AC.L1-3.1.20

External Connections

AC.L1-3.1.22

Control Public Information

Show the 13 you already have

IA.L1-3.5.1

Identification

IA.L1-3.5.2

Authentication

MP.L1-3.8.3

Media Disposal

PE.L1-3.10.1

Limit Physical Access

PE.L1-3.10.3

Escort Visitors

PE.L1-3.10.4

Physical Access Logs

PE.L1-3.10.5

Manage Physical Access

SC.L1-3.13.1

Boundary Protection

SC.L1-3.13.5

Public-Access System Separation

SI.L1-3.14.1

Flaw Remediation

SI.L1-3.14.2

Malicious Code Protection

SI.L1-3.14.4

Update Malicious Code Protection

SI.L1-3.14.5

System and File Scanning

How this is calculated

Already covered means a mapping runs from a control in NIST SP 800-171 to that control. Likely covered means no direct mapping exists but both frameworks map to the same control in a third standard. New work means neither. We keep those separate rather than adding them into one friendlier number, because blending them would present a two-hop inference as a verified fact.

Coverage is not symmetric. Run it the other way and you will get a different number; both are correct.

From 332,959 cross-framework control mappings across 723 frameworks, 531 of them verified against their source documents. It does not tell you that you are compliant: a mapped control means the two standards ask for the same thing, not that you have done it.

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