CMMC is here: Why waiting is the biggest risk

The rule is final. The date is real.

For years, the Cybersecurity Maturity Model Certification (CMMC) felt like it was always on the horizon — something to prepare for “someday.” That time has ended. The rule is final, the date is real, and contractors across the defense industrial base (DIB) will see CMMC requirements appear in contracts beginning November.

The question now isn’t whether you’ll need CMMC. It’s whether you’ll be ready in time.

Find out how Diligent’s solutions can help you get there.

What CMMC actually changes

Until now, most DIB companies operated under self-attestation to NIST 800-171. If you’re a current DoD contractor, take a close look at your agreements. If you see DFARS 252.204-7012 in your contract language, you’ve likely already been expected to comply with NIST 800-171 — and may have been self-attesting without realizing it. That system was always fragile: compliance was often a box-checking exercise, and enforcement was rare. CMMC changes that.

• Third-party certification: You’ll need an independent C3PAO (Certified Third-Party Assessment Organization) to validate compliance at Level 2.
• Contract enforcement: If you’re not certified, you won’t be eligible to win or renew certain contracts.
• Limited POA&Ms: Unlike the past, you won’t be able to push major gaps into Plans of Action and Milestones (POA&Ms) and hope they’re overlooked.

In other words, the safety net is gone.

Why delaying is risky

The instinct for many organizations will be to wait — for clearer guidance, for budget approval, or for a signed contract that explicitly requires CMMC. But waiting is the biggest risk you can take, because:

1. Assessment capacity is limited. There are only so many accredited assessors, and demand will spike once contracts start requiring certification. If you’re not in line early, you may not get certified in time.
2. Remediation takes longer than expected. Closing gaps — from MFA rollouts to logging improvements — can take months, sometimes a year plus. Many organizations underestimate the effort required.
3. Revenue disruption is real. If you can’t bid on contracts, competitors who invested early will step in. Once that business is lost, it’s hard to win back.

The CMMC timeline: Key compliance deadlines and what they mean

So what’s actually happening — and when? The early CMMC rollout follows a defined schedule, but beyond 2025, enforcement ramps up in phases. Knowing the key dates — and how they impact eligibility — is essential for staying ahead.

• December 26, 2024: The CMMC Final Rule (32 CFR) took effect. This locked in the framework and signaled the end of “wait and see.”
• January 31, 2025: Official CMMC assessments began. Organizations could now undergo third-party reviews to validate compliance.
• November 10, 2025: The 48 CFR DoD CMMC compliance deadline becomes enforceable. From this point forward, CMMC requirements — including DFARS clause 252.204-7021 — will begin appearing in new DoD solicitations. Contractors must have a valid certification or self-assessment posted in SPRS to be eligible.
• Q1 2026: Broader rollout begins. CMMC Level 1 and Level 2 requirements will show up in more contracts. Level 2 will require third-party certification; Level 1 can still be self-assessed.
• October 31, 2026: Hard deadline. CMMC compliance is required for all new DoD contract awards. No certification means no eligibility — period.
• 2026–2027: Third-party assessments for Level 2 become mainstream. Expect demand for C3PAO slots to spike.
• 2028: Full implementation across the Defense Industrial Base. At this point, CMMC is standard across all applicable contracts.

If your organization handles Controlled Unclassified Information (CUI), these dates aren’t just guidelines — they’re gatekeepers. Missing them means missing out on contracts, revenue, and long-term viability in the defense supply chain.

Real-world example: The contract that slips away

Picture a mid-sized manufacturer with steady DoD work. They know CMMC is coming but delay action, assuming they can ramp up once the rule “really takes effect.”

Then, a recompete contract hits. The RFP requires CMMC Level 2 certification. The company can’t submit a bid because they haven’t started. Their competitor — who already has a CMMC certification — wins the award.

Because certification must be in place at the time of award, there’s no chance to “fix it later.” By the time the manufacturer catches up, their foothold in the DIB supply chain has weakened — all because they assumed they had more time.

Why early action pays off

The organizations that move now will have clear advantages:

• More time for remediation. Complex fixes can be spread out over quarters instead of crammed into weeks.
• Preferred access to assessors. Early movers secure slots with C3PAOs before the rush.
• Stronger competitive position. Being certified early isn’t just about compliance — it’s a differentiator in the market.

The role of partners

No company succeeds with CMMC alone. The process requires coordination across IT, security, compliance, and business leadership. This is where trusted partners matter:

Diligent’s partner network includes experienced advisory firms, accredited assessment organizations, and technology providers who have already helped dozens of companies navigate these same requirements. Leveraging that ecosystem shortens timelines and reduces risk.

What you should do now

If you’re still on the sidelines, here are the immediate steps to take:

1. Run a gap assessment. Identify where you stand against NIST 800-171.
2. Prioritize remediation. Address high-impact gaps first, like MFA, logging, and access control.
3. Engage a partner. Don’t wait until contracts require certification to start building those relationships.
4. Plan for ongoing compliance. CMMC isn’t a one-and-done exercise. Build processes and tools that make compliance sustainable.

No certification, no contract

CMMC isn’t a suggestion. It’s the new stage gate for doing business with the Department of Defense.

If you’re not certified at the time of award, you won’t be eligible — period. That means:

• Lost contracts you can’t even bid on
• Lost subcontractor opportunities as primes refuse to take on noncompliant partners
• Lost credibility as competitors demonstrate certification while you scramble to catch up

The totality of the work hasn’t changed — companies have always needed to secure their systems. What has changed is the enforcement. Certification is now the price of entry. Organizations that act now will protect their contracts and strengthen their position in the defense supply chain. Those that wait risk locking themselves out.

CMMC enforcement starts now. See how Diligent helps you get compliant — before contracts are out of reach.