Enterprise GRC Platform
CMMC Level 3 — Expert
CMMC Level 3 represents the highest maturity level, for the most critical DoD programs and prime contractors protecting Controlled Unclassified Information (CUI) against advanced persistent threats. Level 3 builds on the 110 NIST SP 800-171 controls (Level 2) and adds 24 selected enhanced requirements from NIST SP 800-172. Level 3 is assessed by the DoD's Defense Industrial Base Cybersecurity Assessment Center (DIBCAC), not a C3PAO.
Level 3 — Expert Practices
The 110 Level 2 controls plus 24 selected NIST SP 800-172 enhanced requirements for advanced threat protection. Required for the most critical DoD programs.
Level 3 Scope
- Data Scope: Controlled Unclassified Information (CUI) for the most critical programs
- Practice Count: 110 (NIST SP 800-171) + 24 selected NIST SP 800-172
- Assessment: Government-led by DoD DIBCAC (not a C3PAO)
- Applicability: Prime contractors, R&D organizations, advanced research centers
Who Needs Level 3?
Organizations protecting advanced research or serving as prime contractors in defense sector.
- ✓ DoD prime contractors
- ✓ Defense research organizations
- ✓ National laboratories
- ✓ Universities with defense research
- ✓ Organizations protecting advanced research
- ✓ Critical infrastructure operators
Level 3 — Baseline plus Enhanced Requirements
Level 3 layers a selection of NIST SP 800-172 enhanced requirements on top of the full Level 2 baseline. Select any theme to expand it and see representative enhanced requirements and what each one asks for.
Level 3 requires the full Level 2 baseline (110 NIST SP 800-171 requirements) plus a selected subset of the enhanced requirements in NIST SP 800-172 (24 total across the model). The enhanced requirements are grouped here into representative themes; the exact per-theme selection is illustrative, not the official grouping. IDs use 800-172's 'e' designator. Descriptions are a faithful plain-language summary, not verbatim official text — refer to NIST SP 800-171 and SP 800-172 for authoritative wording.
Level 3 Assessment & Certification
The most rigorous CMMC assessment process
Readiness Prep
Implement the 110 controls plus 24 selected 800-172 requirements, demonstrate maturity (often achieved after Level 2)
Level 2 Prerequisite
Hold a Level 2 (C3PAO) certification before pursuing Level 3
DIBCAC Assessment
Government-led on-site assessment by the DoD's DIBCAC
Certification Award
Final determination, Level 3 status, 3-year validity
Assessment Characteristics
- ✓ Most comprehensive CMMC assessment
- ✓ Includes threat simulation exercises
- ✓ Advanced assessment techniques
- ✓ Government-led by the DoD DIBCAC
- ✓ Requires a prior Level 2 (C3PAO) certification
- ✓ Highest assurance tier
Organizational Requirements
- ✓ Dedicated security team
- ✓ Security architecture team
- ✓ Advanced monitoring infrastructure
- ✓ Incident response capabilities
- ✓ Threat intelligence program
- ✓ Board-level security governance
Level 3 Implementation Timeline & Costs
Illustrative planning ranges only — actual effort and cost vary by scope and are not a quote.
Mid-Size Organization (500+ people)
- ✓ Total timeline: 12-18 months
- ✓ Resource investment: 3-5 FTE
- ✓ Implementation cost: $250K-$500K+
- ✓ Infrastructure investment: $100K-$300K+
- ✓ Assessment cost: $100K-$200K+
Large Organization (1000+ people)
- ✓ Total timeline: 18-24+ months
- ✓ Resource investment: 5-10 FTE
- ✓ Implementation cost: $500K-$1M+
- ✓ Infrastructure investment: $300K-$1M+
- ✓ Assessment cost: $150K-$300K+
Level Progression
You are at the highest CMMC level
CMMC Level 3 represents the highest maturity level in the CMMC model. After achieving Level 3, focus shifts to continuous monitoring and compliance maintenance.
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