The threat CMMC is designed to address extends well beyond email and office computers.For four consecutive years, manufacturing has ranked as the most targeted industry for cyberattacks, according to IBM’s 2025 Threat Intelligence Index. Attackers continue to pursue manufacturers for financial gain, intellectual property and the ability to disrupt operations. Legacy technologies and systems that were never designed for today’s cyber threats can add to that exposure.
The stakes are particularly high within the defense industrial base. Technical drawings, specifications and other controlled unclassified information (CUI) can pass through multiple companies and systems before a component ever reaches a prime contractor.
A drawing, for example, may arrive electronically from a customer, reside on a server, move through engineering and ultimately reach equipment used to manufacture the part. Understanding where that information travels, who can access it and which systems touch it is fundamental to establishing the scope of a CMMC environment. That can be a very different exercise from securing the computers in the front office.
“Manufacturers are exceptionally good at solving tangible problems,” says Michael Eaton, executive director of the Missouri Association of Manufacturers (MAM). “If something breaks on the shop floor, it gets fixed. If a process slows production, it gets reworked. Cybersecurity, on the other hand, is invisible. I once had an owner tell me, ‘My nephew dabbles in computers, so I let him handle all the IT stuff.’”
CMMC is forcing manufacturers to make that invisible problem much more concrete.
From Self-Assessment to Objective Evidence
Anyone accustomed to a quality audit understands that intent and conformance are not necessarily the same thing. A company may believe it is following a required practice, but an assessment asks a different question: Can the organization demonstrate that the requirement is being met?
A similar distinction is emerging with CMMC. For years, defense suppliers could assess their own cybersecurity posture against NIST SP 800-171 requirements. Many made reasonable efforts to do so, but self-assessment left considerable room for differences in interpretation, particularly around scope, documentation and the evidence needed to support a score.
Formal assessment brings those assumptions into sharper focus. The difference between an organization’s self-assessed score and its evidence-based post-assessment score averaged negative 133 points. A gap that large is usually not attributable to one missing security tool or one major technical failure. Instead, points can disappear across dozens of requirements.
A control may exist but lack sufficient documentation. A policy may describe something employees do not consistently practice. A system that handles CUI may have been left outside the assumed security boundary. In other cases, the company may simply lack the evidence needed to demonstrate that a required practice has been implemented.
Most manufacturers are doing a lot of the right things,” Eaton says. “The problem is they don’t realize how much is involved once you look at data flow, documentation and evidence, and how everything connects.”
For quality professionals, the concept is familiar. The assessment is not based solely on what an organization intended to implement. It depends on what can be demonstrated.
Readiness Reaches Across the Organization
That is also why CMMC can become much larger than an IT project. Preparing for an assessment can require a manufacturer to trace where CUI enters the organization, understand where it is stored and transmitted, determine who can access it and establish which systems belong inside the assessment boundary.
Technical deficiencies then have to be addressed, but technology is only part of the work. Policies may need to be developed or revised. Responsibilities must be assigned. Required practices have to become repeatable. Evidence must be collected to demonstrate that those practices are actually occurring.
The process can reach engineering, operations, human resources, management and the production floor. For a large defense contractor, those responsibilities may be distributed across cybersecurity, compliance and legal teams. At a small manufacturer, several of them may land on the same person.
“This isn’t something you muscle through after hours,” Eaton says. “Most owners are already spread thin. They don’t have the time or the internal resources to interpret what’s required, let alone to make sure it all gets completed and documented properly.”
Depending on a company’s starting point, reaching the required level of readiness can take six months or more. A manufacturer that waits until a CMMC requirement appears in an important opportunity may therefore be starting too late.
Establish the Baseline Before Buying the Fix
That timing makes the first step especially important. A manufacturer that does not know its actual cybersecurity posture can spend considerable time and money solving the wrong problems. Adding another security product, for example, may accomplish little if the larger issue is an incorrectly defined boundary, missing documentation or a requirement that was misunderstood from the beginning.
A gap assessment establishes the baseline before remediation begins. For manufacturers without dedicated CMMC expertise, an RPO can help interpret the requirements, evaluate the existing environment, identify deficiencies and develop a prioritized path toward readiness. RPOs can assist with preparation, but they do not perform the third-party certification assessment itself. When one is required, that assessment is conducted by an authorized CMMC Third-Party Assessment Organization (C3PAO).
“My advice is always the same,” Eaton says. “Don’t try to go it alone. What we do at MAM is connect our members with an RPO.”
For an association representing small manufacturers, making that connection also requires trust. Eaton says MAM vets providers before referring members because owners often do not have the time or expertise to evaluate the growing field of cybersecurity consultants themselves.
“They meet manufacturers where they are and map a path to the finish line,” Eaton says. “That clarity is what our members need. They don’t need more noise. They need someone who understands manufacturing and understands CMMC.”
CMMC Is Becoming a Supplier Qualification Issue
The business implications become clearer when CMMC is viewed through the lens of supplier qualification.
DoD began phasing CMMC requirements into applicable contracts in November 2025, with implementation occurring over three years. As those requirements reach prime contractors, applicable requirements flow down to subcontractors handling protected information.
A manufacturer can be technically capable of producing a component, have the right equipment, maintain the required tolerances and possess years of experience on a program. None of those strengths necessarily solves a CMMC eligibility problem.
For suppliers heavily dependent on defense work, that creates a significant business risk. Eaton has encountered small manufacturers for which defense-related contracts represent 80% to 90% of revenue. Losing access to that work would not simply require finding another customer. It could require finding an entirely new market.
Prime contractors have exposure as well. A specialized supplier that cannot satisfy an applicable cybersecurity requirement may need to be replaced, potentially creating sourcing delays, qualification costs and schedule pressure.
Cybersecurity readiness is therefore becoming another factor in the supplier equation alongside quality, cost, delivery and technical capability.
A Shrinking Window for Small Suppliers
There is another constraint that cannot be solved simply by deciding to act later. CMMC implementation is bringing thousands of companies through the readiness and assessment process over time. The number of experienced professionals available to help organizations prepare, and the number of authorized organizations available to conduct required third-party assessments, are not unlimited.
That creates the potential for a capacity problem as more contract requirements take effect.
A manufacturer that begins early can identify deficiencies, establish priorities and work through remediation on a manageable schedule. One that waits until a contract depends on certification may find itself competing for assistance while facing a deadline it cannot control.
The challenge is particularly acute for small manufacturers because the cybersecurity requirement does not shrink with the size of the organization. That has begun to attract the attention of policymakers. Eaton says MAM has been advocating for funding mechanisms that could help smaller manufacturers absorb some of the cost associated with CMMC readiness, and Missouri lawmakers have begun exploring possible approaches.
Financial assistance could help keep capable small suppliers in the defense industrial base. It does not, however, eliminate the need to understand the size of the problem now. Manufacturers are accustomed to demanding specifications, customer audits and new requirements. Once a problem is clearly defined, they tend to solve it.
For CMMC, the first challenge may simply be determining how much work remains before the clock runs out.
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