NIST 800-53

NIST 800-53 is the catalog of security and privacy controls used by US federal information systems. If you sell SaaS to federal contractors, defense contractors, or directly to agencies, you’ll encounter it in two ways:

1. Indirectly — via FISMA, FedRAMP, DoD CMMC, and HIPAA all of which derive from 800-53
2. Directly — when a federal customer requires you implement specific 800-53 controls in your environment

The catalog has 1,189 controls across 20 control families. You don’t implement all of them — you scope to a baseline (Low / Moderate / High) based on the impact level of the data you handle.

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Baselines

For most SaaS companies entering the federal market, Moderate is the target. It maps closely to FedRAMP Moderate and CMMC Level 2.

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How Codex maps the high-leverage families

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AC — Access Control (25 controls in Moderate baseline)

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AU — Audit and Accountability (12 controls in Moderate)

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CM — Configuration Management (10 controls in Moderate)

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CP — Contingency Planning (9 controls in Moderate)

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IA — Identification and Authentication (12 controls in Moderate)

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IR — Incident Response (9 controls in Moderate)

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RA — Risk Assessment (5 controls in Moderate)

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SC — System and Communications Protection (24 controls in Moderate)

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SI — System and Information Integrity (15 controls in Moderate)

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What Codex doesn’t replace

NIST 800-53 has a heavy policy + process component that Codex doesn’t auto-generate:

• PL Planning controls — your System Security Plan (SSP) is a 100+ page document describing every control’s implementation. Codex provides the evidence; you write the prose.
• PM Program Management controls — organization-wide program (CISO function, threat awareness program, etc.). Pure organizational design.
• PS Personnel Security controls — background checks, position designation. HR-system data, mostly manual.

Codex’s role: provide the technical evidence for ~70% of the catalog. Your security team writes the SSP, conducts the assessments, and engages the assessor.

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Connection to FedRAMP

If you want to sell to federal agencies directly (not just contractors), you need FedRAMP authorization — a formal third-party assessment of your 800-53 implementation. Three paths:

1. FedRAMP Tailored — for low-impact SaaS (think: simple form-collection apps). ~120 controls. ~6 months, ~$50K-100K.
2. FedRAMP Moderate — the default for most B2B SaaS to federal. ~325 controls. ~12-18 months, ~$300K-500K.
3. FedRAMP High — only for sensitive workloads. ~410 controls. ~18-24 months, ~$500K-1M.

See the FedRAMP guide for the authorization workflow.

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When you’re ready

Reports → NIST 800-53 evidence package outputs:

• Per-control implementation evidence with timestamps
• Control inheritance map (which controls rely on which CSP — AWS GovCloud, Azure Government — vs your application’s implementation)
• Continuous monitoring metrics (the ConMon report federal customers expect monthly)
• Plan of Action and Milestones (POAM) for any controls you’ve documented as exceptions