CISA guidance for defense contractors: where CPGs meet CMMC and NIST 800-171
Defense contractors juggle CMMC, NIST 800-171, and CISA guidance at once. How the frameworks overlap — and how to avoid paying for the same work twice.
If you handle controlled unclassified information, CMMC and NIST 800-171 are your binding requirements — but CISA's CPGs and KEV discipline are what keep you secure between assessments. The smart play is one program, not three.
How the pieces fit
- NIST 800-171 / CMMC: the contractual requirement. 110 practices (Level 2), assessed by an authorized C3PAO.
- CISA CPGs: the operational baseline — MFA, KEV patching, backups, segmentation. Most of it maps into 800-171 controls.
- KEV catalog: patch-on-CISA-timelines discipline that satisfies both vulnerability-management controls and common contract flow-downs.
Avoiding double work
Run one control inventory mapped to all three frameworks. A CPG gap assessment and an 800-171 readiness assessment should be one engagement with two lenses — tell prospective firms you want a unified gap list. Directory firms tagged for the contractor stage — Summit 7, SecureStrux, Redspin, Sera-Brynn, Coalfire — do this routinely.
Sequencing
Readiness assessment → remediation → C3PAO assessment. See our timeline for realistic durations, and remember: readiness firms prepare you, C3PAOs assess you — they're different roles.
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