Comparisons anchored on CMMC, the DoD's Cybersecurity Maturity Model Certification program under 32 CFR Part 170: against NIST SP 800-171, NIST SP 800-53, ISO 27001, SOC 2 and the NIST CSF.
The most common defense contractor question: NIST SP 800-171 is the requirement set, CMMC is how DoD verifies it. Covers why CMMC Level 2 still uses the 110 Rev. 2 requirements while the current NIST version is Rev. 3, self-assessment versus C3PAO certification, SPRS scores and Conditional status, the 2026 Phase 2 suspension, and DoD assessment cost estimates.
For contractors with both federal civilian and defense work: SP 800-53 is the full federal control catalog behind FISMA and FedRAMP, while CMMC Level 2 assesses the 110 SP 800-171 Rev. 2 requirements. Covers how NIST tailors SP 800-171 from the 800-53 moderate baseline, the FedRAMP Moderate rule for cloud services holding CUI, assessment methods, and which assessment applies to which contract.
For manufacturers and suppliers serving defense and commercial customers: CMMC is a contract condition for handling FCI or CUI, while ISO/IEC 27001 is a voluntary, internationally recognized ISMS certificate. Covers what each assessment verifies, who chooses the level, assessment bodies and cycles, scoping by CUI asset category versus ISMS scope, and published CMMC cost figures.
For SaaS and IT service companies with defense customers: CMMC verifies NIST SP 800-171 for contractors and the external service providers in their scope, while SOC 2 is a commercial attestation. Covers when a provider falls in a contractor's CMMC assessment, voluntary ESP certification, FedRAMP Moderate for cloud offerings holding CUI, and how the two audits differ in cost and cadence.
A contractual certification program versus a voluntary framework: CMMC levels and assessment rules are fixed in 32 CFR Part 170, while CSF 2.0 profiles and tiers describe enterprise outcomes. Covers how the CSF Reference Tool maps to SP 800-171 Rev. 3 while CMMC still uses Rev. 2, what a CSF program covers outside the CUI scope, and what contractors must do first.
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