Government Contractor IT: CMMC + NIST 800-171 Compliance Guide

Defense contractors must meet CMMC Level 2 to bid on most DoD contracts. This guide covers NIST 800-171 controls, System Security Plans, and how to achieve certification.

Government contractors handling Controlled Unclassified Information (CUI) face one of the most demanding IT compliance requirements: NIST SP 800-171 enforced through CMMC 2.0. DFARS 252.204-7012 has required NIST 800-171 compliance since 2017 — and CMMC 2.0 now adds third-party assessment requirements for most DoD contracts.

CMMC Level 2: 110 Controls Across 14 Families

Level 2 requires implementation of all 110 NIST SP 800-171 practices covering access control, audit and accountability, configuration management, identification and authentication, incident response, maintenance, media protection, personnel security, physical protection, risk assessment, security assessment, system and communications protection, system and information integrity, and awareness and training.

System Security Plan (SSP)

Your SSP documents your IT environment, how CUI flows through it, and how each of the 110 controls is implemented. The SSP is required before a C3PAO assessment and is examined in detail by assessors.

Realistic CMMC Timeline

For a company starting from scratch: months 1-3 for gap assessment and high-priority controls, months 4-8 for technical control implementation, months 9-11 for policy documentation and training, and month 12 for C3PAO assessment. Most companies need 9-18 months total.