DFARS Clause Renumbering Under the CMMC Deviation: What Contractors Need to Know

Recent updates to the Defense Federal Acquisition Regulation Supplement (DFARS) under the Cybersecurity Maturity Model Certification (CMMC) Class Deviation are changing clause numbering in new solicitations and contract awards.

The security requirements themselves have not fundamentally changed. However, contractors will begin seeing different clause numbers tied to Controlled Unclassified Information (CUI) safeguarding, NIST Special Publication 800-171 (NIST SP 800-171) assessments, and certification requirements. These updates reflect the restructuring of cybersecurity rules under revised Federal Acquisition Regulation (FAR) Part 40 and new DFARS Part 240, which may require teams to revisit what does CMMC mean and how do you become compliant.

For Department of Defense contractors, this is largely an administrative shift. Even so, it introduces a practical risk during contract review if internal teams are not aware of the renumbering, especially for organizations supporting the Defense Industry Base.

What Is Changing in DFARS and FAR  

As part of the reorganization, several familiar clauses are being renumbered or retired:

The goal is to consolidate cybersecurity and certification-related requirements into a more structured regulatory framework. Over time, this alignment under FAR Part 40 and DFARS Part 240 should improve consistency across federal acquisitions.

In the short term, contractors reviewing new solicitations may encounter clause numbers that appear unfamiliar, even though the underlying obligations remain consistent.

What Has Not Changed 

A new clause number does not create a new compliance requirement.

The core obligations remain intact:

If your organization was already aligned with DFARS 252.204-7012, 7020, and 7021, your technical and procedural responsibilities have not materially shifted because of this renumbering.

The framework has been reorganized. The compliance expectations remain the same.

Why This Matters for Contract Review and Compliance Teams 

The primary impact of this change is operational. Most contractors rely on established clause matrices, compliance checklists, and contract review procedures that reference specific FAR and DFARS citations. When those numbers change, even without altering the substance, the risk of misinterpretation increases. Potential issues include:

For organizations pursuing Level 2 certification under CMMC, precision in documentation is especially important. Evidence of NIST SP 800-171 implementation and SPRS reporting must align with current contractual language, including how you align priorities and identify gaps and sustain progress through continuous monitoring and maturity.

Practical Steps Contractors Should Take 

Contractors should treat this renumbering as a trigger to review and strengthen internal processes.

Recommended actions include:

	Update contract review checklists  Cross-reference legacy DFARS 252.204-7020 with DFARS 252.240-7997. Ensure FAR 52.240-93 is recognized as the successor to FAR 52.204-21.
	Revise compliance matrices and crosswalks  Update internal documentation, so clause references align with the new numbering structure.
	Refresh internal training  Ensure contracts, compliance, and program management personnel understand that renumbered clauses still carry the same safeguarding and assessment requirements.
	Review subcontractor templates Confirm that flow-down clauses reflect current citations in new solicitations and awards.
	Validate external compliance support If you work with a managed security services provider or advisory partner, confirm their documentation references are up to date.

These steps are administrative in nature. However, they are essential to maintaining defensible compliance, especially when your program includes structured gap assessments, ongoing virtual compliance management, and disciplined policy development and review.

A Broader Integration of Cybersecurity into Federal Acquisition  

The movement of these requirements into FAR Part 40 and DFARS Part 240 reflects a larger shift. Cybersecurity and certification are becoming structurally embedded in federal acquisition policy rather than treated as supplemental clauses.

For contractors handling CUI, safeguarding obligations are now firmly integrated into the acquisition of lifecycle. This reinforces a clear message: cybersecurity maturity is a baseline expectation for participation in the Defense Industrial Base.

Organizations that maintain disciplined contract review practices and proactive compliance management will be better positioned for assessments, audits, and competitive opportunities.

How MAD Security Supports Contractors Through Regulatory Changes  

MAD Security works with defense and government contractors navigating DFARS, CMMC, and NIST SP 800-171 requirements. As a CMMC Registered Provider Organization and managed security services provider, MAD Security helps organizations:

 For teams that need operational coverage tied to compliance outcomes, MAD Security’s managed services can complement governance work through SOC-as-a-Service, threat detection, and vulnerability assessment.  

Final Takeaway 

If unfamiliar FAR or DFARS clause numbers appear in new solicitations, do not assume your obligations have changed. The citation structure has shifted. The safeguarding, assessment, and certification expectations remain consistent.

Now is the time to:

Clear contract interpretation and disciplined compliance management are foundational elements of cybersecurity maturity. Contractors who proactively adapt to regulatory updates reduce risk and strengthen their position within the defense marketplace.

If you would like assistance reviewing your contracts, validating clause crosswalks, or building an assessment-ready program, start with MAD Security’s CMMC solution approach or contact MAD Security today.

Frequently Asked Questions (FAQs) 

Original Publish Date: March 19, 2026

Author: Jaclyn Jones | GRC Compliance Lead, CISSP, Lead CCA, CySA+ 

Reviewer: Caleb Parrow | Senior Cybersecurity Consultant, CASP+, CySA+, Security+