Understanding CMMC: What defense contractors need to know

Executive Summary

• CMMC is the DoD’s standardized framework for enforcing cybersecurity across the defense supply chain. It replaces self attestation with defined certification levels tied to how contractors protect sensitive government information.
• Requirements vary based on the type of data handled. Organizations that access Federal Contract Information (FCI) or Controlled Unclassified Information (CUI) must meet specific control sets and assessment expectations.
• Understanding the structure, levels, and rollout is essential before planning compliance. Certification scope, assessment timing, and readiness steps depend on where an organization fits within the CMMC ecosystem.

CMMC and DoD Contract Eligibility

Cybersecurity is now a contractual requirement for companies doing business with the U.S. Department of Defense (DoD). Across the Defense Industrial Base (DIB), the Cybersecurity Maturity Model Certification (CMMC) program is the DoD’s mechanism for verifying that contractors and subcontractors adequately protect sensitive defense information within their systems. For organizations pursuing or maintaining DoD contracts, demonstrating baseline cybersecurity controls is no longer optional.

With the final rule published and phased implementation underway, CMMC requirements are being incorporated directly into contracts. Organizations that handle Federal Contract Information (FCI) or Controlled Unclassified Information (CUI) must understand what CMMC requires, how it affects contract eligibility, and how early readiness, supported by an experienced assessment team, fits into the broader compliance picture.

What Is CMMC?

CMMC is a DoD mandated cybersecurity assessment and certification program designed to verify that defense contractors implement required safeguards for FCI and CUI on non federal information systems. Unlike prior frameworks that relied largely on contractor self attestation, CMMC introduces formal assessments tied directly to contract award and continuation.

Oversight of the CMMC ecosystem is handled by the Cyber AB, which accredits CMMC Third-Party Assessor Organizations (C3PAOs) and maintains the CMMC Marketplace under an exclusive contract with the DoD. Together, these elements consolidate existing DoD cybersecurity requirements into a single, enforceable framework applied consistently across the defense supply chain.

Note: ISACA is now the Cybersecurity Assessor and Instructor Certification Organization (CAICO) as of April 1, 2026.

Who Needs CMMC?

Any entity handling DoD contract data is subject to CMMC requirements, including prime contractors, subcontractors, suppliers, and vendors. Since requirements flow down the defense supply chain, even small or indirect participants may need CMMC certification to remain eligible for DoD work.

For organizations handling CUI, this means pursuing a Level 2 certification, which involves a formal third-party assessment.

CMMC 2.0 Certification Levels

CMMC 2.0 simplifies the original model into three certification levels:

The DoD estimates that over 80,000 entities will be required to meet CMMC Level 2 requirements to remain eligible for defense contracts. For these organizations, engaging a qualified team to perform a CMMC Readiness Assessment is often critical to identifying gaps and reducing assessment risk before interacting with a C3PAO.

As CMMC continues to roll into new and existing DoD contracts, failure to meet the required certification level can result in loss of eligibility for defense work.

Why CMMC Matters Now

The DoD finalized the CMMC rule in October 2024, and phased implementation is now underway. As of November 10, 2025, CMMC requirements began appearing in solicitations and contracts, marking the transition from policy to enforcement across the defense supply chain.

For defense contractors, non compliance carries tangible consequences, including ineligibility for contract award, loss of option years, and flow down challenges with prime contractors and subcontractors. As a result, CMMC is already influencing near-term contract access and bidding decisions.

CMMC Readiness Assessment

A CMMC readiness assessment evaluates both the implementation and documentation of applicable CMMC requirements while preparing the organization for a future formal assessment.

Readiness activities typically include the following steps:

1. Define Assessment Scope: Confirm which CMMC level applies and what needs to be included in the assessment. Identify the systems, environments, and contracts that fall within the scope.
2. Evaluate Implementation and Documentation: Review the implementation of each CMMC requirement, including System Security Plans, policies, procedures, and supporting evidence.
3. Assess Requirement Maturity: Analyze evaluation results to determine whether each CMMC requirement is met, not met, or not applicable.
4. Develop and Prioritize Remediation Recommendations: Design actionable recommendations for each requirement that is not fully implemented to support progression to full implementation.
5. Report and Review Results: Document assessment results and review findings, recommendations, and next steps with management.

These efforts reduce assessment risk and support informed decision making, while remaining independent from the formal certification process conducted by authorized assessors.

We Can Help

CMMC represents a more rigorous approach to how the DoD enforces cybersecurity across the defense supply chain. While many underlying controls are familiar, verification, accountability, and contractual consequences are new.

Organizations that invest early in CMMC readiness gain clearer visibility into scope, cost, and timing, positioning them to compete for and retain defense work as requirements enter contracts.

Elliott Davis supports defense contractors through CMMC readiness services focused on education, assessment, and planning. Our work helps organizations understand where they stand, what gaps exist, and how to move forward with confidence as CMMC requirements continue to take effect.

Contact us today to start the conversation.

‍

‍

The information provided in this communication is of a general nature and should not be considered professional advice. You should not act upon the information provided without obtaining specific professional advice. The information above is subject to change.