FedRAMP Equivalency for CMMC: What Cloud Providers Must Demonstrate

Contractors that put CUI in a cloud must require the service to hold FedRAMP Moderate authorization or demonstrate equivalency to the FedRAMP Moderate baseline. DoD CIO sets that condition and defines how a provider proves it through independent assessment and documentation.

FedRAMP equivalency definition

DoD CIO distinguishes FedRAMP authorization from FedRAMP equivalency. Authorization uses a government sponsor and an Authorizing Official decision. Equivalency applies when a cloud service offering (CSO) that will store, process, or transmit covered defense information does not hold an authorization at the needed level. In that case, the provider must meet security requirements equivalent to the FedRAMP Moderate baseline for the relevant service.

DoD CIO also links this condition to CMMC application. If a contractor intends to handle CUI in a cloud offering, the contractor must use a service authorized at Moderate or require Moderate equivalency from the provider.

Cloud provider proof requirements

A provider that seeks equivalency must submit to a FedRAMP-recognized third-party assessment organization (3PAO). The assessor tests the CSO against the latest FedRAMP Moderate baseline. The provider demonstrates one hundred percent implementation of the Moderate controls when the 3PAO concludes testing. DoD CIO directs providers to avoid residual risks that would require government risk acceptance, because no government sponsor or Authorizing Official stands behind an equivalency decision.

DoD CIO accepts ongoing plans of action and milestones after assessment and during operation for equivalency. The provider addresses open items under a continuous monitoring program and does not depend on an Authorizing Official to accept risk on the contractor’s behalf.

Required assessment evidence

DoD CIO expects a Body of Evidence that supports the equivalency claim. The provider hands the contractor and the assessor a package that includes two core artifacts.

• A system security plan (SSP) that defines the CSO boundary, the implemented FedRAMP Moderate controls, and the methods and frequency of control performance.
• A customer responsibility matrix (CRM) that maps each relevant control outcome to provider tasks or contractor tasks.

The package also needs independent assessment results from a FedRAMP-recognized 3PAO.

• A test report that traces the Moderate controls to objective evidence, with findings resolved to full implementation at assessment close.
• A current POA&M register and operational monitoring reports that show how the provider tracks and closes items after assessment.

The CMMC ecosystem uses the same Body of Evidence concept. The Cyber AB CMMC Assessment Process v2.0 describes the materials an assessor may review and how the assessor uses provider documentation to support a contractor’s practice implementation.

Alignment with CMMC Level 2

CMMC Level 2 assessors evaluate whether the contractor’s implementation satisfies the NIST SP 800-171 practices. If a contractor uses a cloud service for CUI, the assessor reviews the provider’s documentation and shared responsibility information to confirm that the provider supports the contractor’s implementation where the provider holds responsibility. The Level 2 Assessment Guide explains that dynamic.

A sound CRM helps the team align provider tasks to specific NIST controls. Two examples:

• Access control practices such as 3.1.1 and 3.1.2 depend on capabilities the provider configures inside the CSO and on identity, policy, and device measures the contractor enforces. The CRM should name the split.
• Audit and accountability practices such as 3.3.1 depend on provider log retention and exposure, and on the contractor’s collection, review, and escalation process.

The final CMMC rule at 32 CFR Part 170 governs the program structure and assessment conditions. DFARS acquisition clauses govern the contractor’s cloud use obligations. Treat those rule sets as related but separate. DoD CIO’s equivalency guidance speaks to the contractor’s use of a CSO for CUI and the provider proof required for that use case.

Shared responsibility boundaries

A clear CRM sits at the center of equivalency. The provider shows which FedRAMP Moderate control outcomes it delivers inside the CSO. The contractor shows how it meets the remaining outcomes through configuration, identity, device health, logging, incident handling, and user behavior. A weak CRM leads to orphaned outcomes and assessment disputes.

Tie the provider CRM to your own SSP and procedures. Map each shared control to a named control owner, a control method, and a test. If the provider states a precondition, record how you meet it. If the provider exposes a setting, record how you configure and monitor it.

Avoidable mistakes

Two patterns break assessments.

• Treating equivalency as a marketing claim without a FedRAMP-recognized 3PAO assessment. DoD CIO expects independent assessment against the current Moderate baseline and a complete implementation outcome at assessment close.
• Treating equivalency as a blanket status for a brand logo. The requirement applies to the specific CSO that will handle your CUI, not to unrelated services under the same provider.

Two documentation gaps stall progress.

• Omitting the CRM or delivering a CRM that fails to map to control outcomes. Assessors need to see the split by practice.
• Failing to hand your assessor the provider test report and POA&M register. The assessor cannot rely on a claim; the team needs evidence from the 3PAO.

Practical contractor actions

Ask for two items from any provider that will handle your CUI.

• The 3PAO Moderate assessment report that shows full implementation at close and the current POA&M register that shows how the provider works open items during operation.
• The SSP and CRM for the specific CSO you will use, not a generic whitepaper.

Align your internal documentation and controls to that evidence.

• Update your system security plan to cite the provider’s SSP sections and CRM rows for each shared control. Record your side of the split for identity, device, and logging.
• Validate your DFARS posture and contract language. Review our summary of DFARS 252.204-7012 requirements and confirm incident reporting, media preservation, and notification terms with the provider.

Contractors working in Microsoft clouds should confirm the authorization or equivalency status of the specific services that will handle CUI and align shared responsibilities across identity, device health, and data protection features. Microsoft’s Purview documentation covers labeling and protection features that help meet contractor-side obligations, and service availability varies by cloud.

Microsoft feature note

Microsoft documents Microsoft Purview Information Protection capabilities for data classification and labeling. Those features can support contractor-side controls such as access enforcement and data handling when you configure them to meet your SSP. Confirm availability for your tenant’s cloud and SKU in Microsoft documentation before you commit a control method.

Sources

DoD FedRAMP Authorization and Equivalency (DoD CIO)
DoD CMMC Technical Application Requirements (DoD CIO)
CMMC Level 2 Assessment Guide (DoD CIO)
CMMC Assessment Process v2.0 (The Cyber AB)
Cybersecurity Maturity Model Certification (CMMC) Program (Federal Register)
NIST SP 800-171 Rev. 2 (NIST)
Microsoft Purview documentation (Microsoft Learn)