ISO 27001 to CMMC 2.0: control mapping & evidence reuse
10 of 13 control domains map directly. See exactly where ISO 27001 and CMMC 2.0 overlap, which evidence carries over, and which engagement to run first.
How ISO 27001 and CMMC 2.0 relate
Companies in the defense industrial base that handle Controlled Unclassified Information need CMMC 2.0 Level 2, and many of them also hold or pursue ISO 27001 to satisfy commercial and international buyers. Mapping the two frameworks lets a single security program serve both goals, so risk assessments, access reviews, logging, and incident response do not have to be built twice.
The two frameworks are structured very differently. ISO 27001:2022 is a management-system standard: mandatory ISMS clauses 4 through 10 plus 93 Annex A controls organized into four themes (organizational, people, physical, and technological), certified by accredited certification bodies on a three-year cycle. CMMC 2.0 Level 2 is a US Department of Defense program built on the 110 practices of NIST SP 800-171 Rev. 2 across 14 control families, assessed by an authorized C3PAO. They overlap heavily on technical and operational controls but differ in governance framing, scope, and how conformity is demonstrated.
This crosswalk is practical guidance from AuditNex to help teams plan a combined program. It is not an official ISO or Department of Defense crosswalk, so always confirm each mapping against the source standards and your own scope before relying on it for an assessment.
Domain-by-domain mapping
Each row pairs the closest ISO 27001 and CMMC 2.0 requirements for one control domain. This is practical audit-planning guidance, not an official crosswalk published by the standards bodies.
Across 13 control domains, 10 map directly between ISO 27001 and CMMC 2.0, 2 map partially, and 1 have no equivalent on one side. Counts are computed live from the mapping table below.
| Control domain | ISO 27001 reference | CMMC reference | Match & notes |
|---|---|---|---|
| Governance & risk assessment | Clauses 4–10 ISMS; 6.1.2 & 8.2 risk assessment; A.5.1 | RA 3.11.1–3.11.3; CA 3.12.1–3.12.4 | Direct match Both squarely require documented risk assessment and periodic security assessment. ISO adds a broader ISMS governance layer (management review, context, leadership) that has no direct 800-171 counterpart. |
| Policies & documentation | A.5.1 policies; Clause 7.5 documented information | CA 3.12.4 (system security plan) | Partial ISO mandates a formal documented ISMS with defined documented information across clauses. CMMC centers documentation on the system security plan and per-practice procedures, so scope and formality differ. |
| Access control & identity | A.5.15–A.5.18 access control | AC 3.1.1–3.1.22; IA 3.5.1–3.5.11 | Direct match Both require least-privilege access, account management, and authentication. CMMC's AC and IA families are more prescriptive on specific mechanisms, while ISO frames the same intent as risk-based controls. |
| Change management | A.8.32 change management | CM 3.4.3–3.4.4 | Direct match Both require controlled, tracked changes to systems. ISO uses a single change-management control while CMMC anchors the same expectation in the configuration-management family. |
| Data protection & encryption | A.8.24 cryptography | SC 3.13.8, 3.13.11 & 3.13.16 | Direct match Both require cryptographic protection of sensitive data. CMMC scopes encryption specifically to CUI and mandates FIPS-validated cryptography, whereas ISO leaves algorithm choice to a risk-based crypto policy. |
| Logging & monitoring | A.8.15–A.8.16 logging & monitoring | AU 3.3.1–3.3.9; SI 3.14.6–3.14.7 | Direct match Both require event logging and monitoring for anomalies. CMMC's audit family is more prescriptive about audit-record content and review, while ISO states the outcome at a higher level. |
| Incident response | A.5.24–A.5.28 incident management | IR 3.6.1–3.6.3 | Direct match Both require an incident response capability with detection, handling, and lessons learned. CMMC ties reporting to DFARS obligations for cyber incidents affecting CUI, an obligation ISO does not impose. |
| Vendor & third-party risk | A.5.19–A.5.23 supplier relationships | AC 3.1.20 external systems; DFARS 252.204-7012 flow-down | Partial ISO has dedicated supplier-relationship and cloud-service controls. CMMC has no vendor-risk family and relies on external-system limits plus contractual DFARS flow-down, so coverage is narrower. |
| Business continuity & availability | A.5.29–A.5.30 continuity & ICT readiness | No direct equivalent | No equivalent ISO requires continuity and ICT-readiness controls, but NIST SP 800-171 has no continuity or backup family, so CMMC Level 2 does not cover this domain. |
| Personnel security & training | A.6.1–A.6.6 people controls incl. A.6.3 awareness | PS 3.9.1–3.9.2; AT 3.2.1–3.2.3 | Direct match Both require screening, terms of employment, and security awareness training. The two align closely, though ISO also addresses NDAs and disciplinary process in more detail. |
| Asset & configuration management | A.5.9–A.5.14 asset management; A.8.9 configuration | CM 3.4.1–3.4.2 & 3.4.6–3.4.7 | Direct match Both require asset inventory and configuration baselines. ISO adds information classification and handling requirements that CMMC does not spell out as separate controls. |
| Physical & environmental security | A.7.1–A.7.4 physical security | PE 3.10.1–3.10.6 | Direct match Both require physical access control and monitoring of facilities. Scope is comparable, though ISO's physical theme also covers environmental threats and equipment maintenance more explicitly. |
| Vulnerability & patch management | A.8.8 technical vulnerability management | RA 3.11.2–3.11.3; SI 3.14.1 | Direct match Both require identifying and remediating technical vulnerabilities. CMMC splits the work across risk-assessment scanning and system-integrity flaw remediation, while ISO uses a single technical vulnerability control. |
Which should you do first?
For most defense contractors the CMMC timeline is contract-driven, so 800-171 and CMMC readiness is frequently the immediate priority. That said, ISO 27001's ISMS provides a governance backbone (documented risk assessment, policy set, and management review) that makes CMMC evidence far easier to organize. A company that already holds ISO 27001 has a running start on CMMC's access control, audit, configuration, and identification and authentication practices.
Neither framework is a strict superset of the other. ISO 27001 is broader on governance, continuity, and supplier management, while CMMC and 800-171 are more prescriptive on the specific technical practices that protect CUI, such as FIPS-validated cryptography and required audit-record content. A company pursuing both should build the ISMS first when timelines allow, then layer CMMC's prescriptive practices on top; if the DoD contract clock is already running, run CMMC readiness first and formalize the ISMS around the controls you implement.
To stage the work efficiently, perform the risk assessment once and reuse it for both efforts, then schedule the C3PAO assessment and the ISO certification or surveillance audits so they can draw on the same evidence collection windows.
Evidence you can reuse
A large share of evidence carries across both audits. Risk assessments, access-control configurations and periodic access reviews, logging and monitoring output, incident response plans and tickets, change-management records, vulnerability scans and remediation records, security awareness training logs, and configuration baselines all support both frameworks. Policies written to ISO Annex A can satisfy much of CMMC's documentation, and the CMMC system security plan (3.12.4) can reference the same policy set.
Some artifacts do not transfer. ISO's continuity and ICT-readiness controls (A.5.29 through A.5.30) have no CMMC Level 2 counterpart, so that evidence does not reduce CMMC scope. Conversely, CMMC's CUI-specific requirements, including FIPS-validated cryptography, CUI marking and media handling, and DFARS flow-down obligations, go beyond generic ISO controls and need dedicated evidence. The conformity mechanics also differ: ISO uses accredited certification bodies on a three-year cycle while CMMC uses C3PAOs, so the assessment artifacts and scoping boundaries are not interchangeable.
Find auditors for each framework
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Sources: ISO/IEC 27001:2022 — Information security management systems (Clauses 4–10 and Annex A); CMMC 2.0 Level 2 Assessment requirements (US Department of Defense); NIST SP 800-171 Rev. 2 — Protecting Controlled Unclassified Information in Nonfederal Systems and Organizations; DFARS 252.204-7012 — Safeguarding Covered Defense Information and Cyber Incident Reporting. Mapping maintained by the AuditNex research team; last reviewed July 26, 2026. This crosswalk is practical guidance for planning combined audits — it is not an official mapping published by AICPA, ISO, HHS, DoD, or the FedRAMP PMO, and your auditor makes the final scoping call.