The Most Common Gaps Found Right Before CMMC Assessments

For many DoD contractors, the weeks leading up to a CMMC assessment are when confidence is highest. Policies are written, tools are deployed, documentation exists, and leadership believes the organization is ready.

This is also the moment when the most damaging gaps surface.

Not because teams were careless or ignored requirements, but because CMMC assessments are designed to validate how security operates in reality, not how it is described on paper. The difference between perceived readiness and assessment readiness is where most delays, findings, and failures occur.

This article outlines the most common gaps that appear right before CMMC assessments, why they happen, and how organizations can identify them early enough to fix them.

Why These Gaps Appear Late in the Process

Most organizations approach CMMC as a project with a finish line. Controls are implemented, documentation is produced, and readiness is assumed once everything is “in place.”

Assessors, however, are not evaluating effort. They are validating consistency, repeatability, and evidence of execution over time.

Late-stage gaps usually emerge because:

• Controls were implemented unevenly across teams

• Documentation was created faster than processes matured

• Evidence exists, but is not assessment-ready

• Ownership of controls is unclear

• Day-to-day behavior does not fully align with written policy

None of these issues are obvious during planning or initial implementation. They surface when assessors start asking how things actually work.

Gap #1: Documentation Exists, but Implementation Is Inconsistent

This is the most common and most misunderstood issue.

Organizations often have well-written policies that technically address CMMC requirements. The problem is that implementation varies depending on the team, role, or individual.

Examples include:

• Access control policies that are followed strictly by IT, but loosely by engineering

• Incident response procedures that exist, but staff are unsure how to execute them

• Change management policies that are followed during major changes, but ignored for “small” ones

Assessors validate whether controls are applied consistently across the environment, not just whether a policy exists.

If two people answer the same control question differently during interviews, that inconsistency becomes a finding.

Gap #2: Tools Are Deployed but Not Operationally Enforced

Many organizations invest heavily in security tools to meet technical requirements. This is necessary, but it is not sufficient.

Assessors routinely find:

• Logging tools collecting data that no one reviews

• Monitoring alerts configured but ignored

• MFA technically enabled but bypassed through exceptions

• Endpoint protection installed but not centrally monitored

From an assessment perspective, a control that is not actively used, reviewed, or enforced is treated as partially implemented at best.

CMMC emphasizes operational effectiveness. Tools must demonstrate ongoing use, oversight, and response.

Gap #3: Evidence Exists but Is Not Assessable

Evidence collection often becomes a scramble late in the process, even when the organization believes it has everything it needs.

Common evidence issues include:

• Screenshots without timestamps or context

• Logs that cannot be tied back to a specific control

• Evidence stored across multiple systems with no clear mapping

• Evidence that exists, but no one knows where it is during interviews

Assessors are not looking for volume. They are looking for traceability.

Evidence must clearly show:

• Which control it supports

• How it demonstrates implementation

• That it reflects ongoing practice, not a one-time snapshot

When evidence cannot be quickly explained or mapped, assessments slow down and risk increases.

Gap #4: Control Ownership Is Unclear or Assumed

Assessors frequently ask a simple question that exposes a major weakness:

“Who owns this control?”

In many organizations, the answer is unclear, shared, or assumed to be “IT.”

Common problems include:

• Controls owned informally, not formally assigned

• Ownership split across departments without coordination

• Backup owners not identified

• Owners unaware they are responsible for the control

Without clear ownership:

• Controls degrade over time

• Evidence collection becomes fragmented

• Interview responses vary

• Accountability is lost

Mature organizations explicitly assign ownership for every control and ensure owners understand their responsibilities.

Gap #5: Staff Awareness Does Not Match Documentation

CMMC assessments include interviews because behavior matters.

Assessors often discover that:

• Staff are unaware of certain policies

• Training occurred once but was never reinforced

• Employees follow informal processes instead of documented ones

• Teams rely on “tribal knowledge” rather than defined procedures

This gap is especially risky because it cannot be fixed quickly. If staff behavior does not align with documentation, assessors will question whether controls are truly institutionalized.

Consistency across people, not just systems, is a core expectation.

Gap #6: Processes Work in Theory but Not Under Real Conditions

Some controls look solid until they are tested under pressure.

Examples include:

• Incident response plans that have never been exercised

• Backup and recovery processes that were never validated

• Access reviews that are scheduled but routinely delayed

• Change approvals that work during audits but not during emergencies

Assessors look for evidence that processes are repeatable and resilient, not idealized.

Organizations that perform internal walkthroughs or stress tests before assessment are far less likely to encounter this gap late.

Gap #7: Readiness Is Assumed, Not Validated

Perhaps the most costly gap is the absence of internal readiness validation.

Many organizations assume readiness based on:

• Completion of documentation

• Tool deployment

• Third-party guidance

• Past experience with other frameworks

CMMC assessments are unique in their emphasis on evidence, interviews, and operational maturity.

Without an internal readiness check that simulates assessor behavior, blind spots remain hidden until it is too late to fix them efficiently.

Why These Gaps Matter More Than Ever

CMMC assessments are not designed to be punitive, but they are designed to be rigorous.

Late-stage gaps can result in:

• Assessment delays

• Corrective action plans

• Increased costs

• Operational disruption

• Loss of confidence internally and externally

Organizations that identify and address these gaps early enter assessments with clarity, control, and far less stress.

How to Identify These Gaps Before an Assessor Does

The most effective organizations treat readiness as a validation exercise, not a paperwork exercise.

They:

• Review controls through an assessor lens

• Validate evidence traceability

• Confirm ownership and accountability

• Test processes under realistic conditions

• Ensure staff understanding aligns with documentation

This does not require perfection. It requires visibility.

Free Resource: Pre Assessment Readiness Checklist

To help organizations validate readiness before engaging an assessor, we created a CMMC Pre Assessment Readiness Checklist.

This checklist is designed to help you:

• Identify common late-stage gaps

• Validate people, process, and technology alignment

• Confirm evidence readiness

• Reduce assessment risk and uncertainty

It is intended for internal use and practical review, not sales conversations.

Download the Pre Assessment Readiness Checklist
and use it to pressure-test readiness before an assessor does.