NIST 800-53 Low, Moderate & High Baselines (SP 800-53B) Explained

What SP 800-53B Covers

• Impact level drives security baseline selection (in RMF / FIPS 199 context)
• Tailoring: scope, common controls, overlays, and compensating controls — documented in plans
• Overlays customize baselines for specific communities, technologies, or environments
• SP 800-171 CUI requirements are historically derived from the moderate baseline with tailoring

Why It Matters

Saying “we do 800-53” without naming Low / Moderate / High (and whether the privacy baseline applies) is incomplete for federal programmes and many contractor questionnaires.

How CyberSilo Helps

• Compliance Standards Automation — track selected baseline plus tailored set
• ThreatHawk SIEM — evidence packs for AU/IR/SI controls in the chosen baseline

Frequently Asked Questions

Is the privacy baseline tied to system impact level?

No. SP 800-53B applies the privacy baseline irrespective of impact level, in addition to the Low, Moderate, or High security baseline.

Can organizations tailor a baseline?

Yes. Tailoring is expected; document selections, overlays, and compensating controls in the security and privacy plans.

Does FedRAMP equal the Moderate baseline unchanged?

FedRAMP uses SP 800-53 baselines with FedRAMP-specific overlays and tailoring. Always follow current FedRAMP baseline documents rather than assuming an unaltered Moderate set.

Related NIST Resources

NIST hub · What Is NIST CSF 2.0? · CSF Function Guides · 800-53 Families