CMMC vs ISO 27001 vs SOC 2: What Transfers?

ISO 27001 and SOC 2 build strong security programmes. CMMC adds defence-industrial expectations around CUI/FCI, assessment pathways, and contract flow-down that neither commercial report fully replaces.

This comparison focuses on transferable work — policies, asset inventories, access control, logging — versus net-new artefacts for DoD supply-chain buyers.

Transfer principle: Reuse process and evidence patterns; do not assume an ISO certificate or SOC 2 report satisfies CMMC assessment objectives without mapping.

Where programmes overlap

Governance, risk assessment, access control, encryption, vulnerability management, and incident response practices often align at the control-intent level.
Central evidence repositories and continuous logging reduce duplicate fieldwork across frameworks.

Where CMMC diverges

CUI handling, specific NIST SP 800-171-aligned practices (as required by the applicable CMMC level), assessor ecosystem rules, and contractual affirmation obligations are defence-specific. SOC 2 trust services criteria and ISO Annex A controls are different taxonomies — map explicitly.

Practical reuse playbook

Keep one control library with framework tags. Link each CMMC practice to existing ISO/SOC evidence, then close gaps with CUI-focused procedures, media protection, and assessment-ready SSP packages.

How CyberSilo Helps

Evidence mapping in CyberSilo CSA
Detection and logging proof with ThreatHawk SIEM
Advisory scoping — contact CyberSilo

Talk to CyberSilo

Map evidence and operations with CyberSilo CSA and ThreatHawk.

Talk to CyberSilo CMMC hub

Frequently Asked Questions

Does ISO 27001 certification equal CMMC?

No. It can accelerate readiness but does not replace a CMMC assessment pathway.

Does a SOC 2 Type II help?

Yes as supporting evidence of operating effectiveness for overlapping domains — still map to CMMC practices.

Should we pursue all three?

Often yes for commercial plus defence customers; sequence by contract pressure and shared control coverage.

CMMC vs ISO 27001 vs SOC 2: What Transfers?

Where programmes overlap

Where CMMC diverges

Practical reuse playbook