CMMC Level 3

CMMC Level 3 is the highest tier, designed for contractors handling the most sensitive CUI where Advanced Persistent Threats (APTs) are a significant concern. It builds on Level 2 by adding enhanced security requirements drawn from NIST SP 800-172.

Level 3 assessments are conducted by DIBCAC (the government itself), not by C3PAOs. This level applies to a relatively small number of contractors working on the most sensitive defense programs. The additional requirements focus on advanced threat detection, incident response, and security architecture.