What is the difference between NIST 800-53 and FedRAMP?

NIST 800-53 is the foundational catalog of security controls, while FedRAMP (Federal Risk and Authorization Management Program) is a compliance program that uses NIST 800-53 controls to authorize cloud services for federal use. FedRAMP defines specific control baselines (Low, Moderate, High) derived from NIST 800-53 for different impact levels.

How many control families are in NIST 800-53 Rev 5?

NIST 800-53 Revision 5 contains 20 control families, expanded from 18 in Revision 4. The new families are PT (Personally Identifiable Information Processing and Transparency) and SR (Supply Chain Risk Management), reflecting modern security concerns around privacy and supply chain attacks.

Is NIST 800-53 mandatory for defense contractors?

Defense contractors handling Controlled Unclassified Information (CUI) must implement NIST 800-171 controls, which are derived from NIST 800-53. For classified systems and FedRAMP authorization, full NIST 800-53 implementation is required as part of the Risk Management Framework (RMF) and Authority to Operate (ATO) process.

NIST 800-53 Security Controls Explained | Alterra Solutions Glossary

Q: What is NIST 800-53?

NIST Special Publication 800-53 is a comprehensive catalog of security and privacy controls for federal information systems and organizations. Published by the National Institute of Standards and Technology, it provides a framework of over 1,000 controls organized into 20 control families, covering everything from access control to system integrity.

Quick Reference

Current Version: Revision 5 (September 2020) • Control Families: 20 • Total Controls: 1,000+ • Applies To: Federal agencies, defense contractors, FedRAMP cloud providers

What is NIST 800-53?

NIST Special Publication 800-53 is a catalog of security and privacy controls published by the National Institute of Standards and Technology. It provides a comprehensive framework for protecting federal information systems and is the foundation for multiple compliance programs including FedRAMP, FISMA, and the Risk Management Framework (RMF).

The document doesn't mandate specific technologies but defines what security outcomes must be achieved, allowing organizations flexibility in how they implement controls.

Control Families (Rev 5)

NIST 800-53 Revision 5 organizes controls into 20 families. Each family addresses a specific security domain:

ACAccess Control

ATAwareness and Training

AUAudit and Accountability

CAAssessment, Authorization, and Monitoring

CMConfiguration Management

CPContingency Planning

IAIdentification and Authentication

IRIncident Response

MAMaintenance

MPMedia Protection

PEPhysical and Environmental Protection

PLPlanning

PMProgram Management

PSPersonnel Security

PTPII Processing and Transparency (New in Rev 5)

RARisk Assessment

SASystem and Services Acquisition

SCSystem and Communications Protection

SISystem and Information Integrity

SRSupply Chain Risk Management (New in Rev 5)

Control Baselines

Not every system needs every control. NIST 800-53B defines three baselines based on the potential impact of a security breach:

Baseline	Impact Level	Example Systems	Control Count
Low	Limited adverse effect	Public websites, non-sensitive data	~125 controls
Moderate	Serious adverse effect	Most federal systems, CUI handling	~325 controls
High	Severe or catastrophic effect	Defense, intelligence, critical infrastructure	~425 controls

NIST 800-53 vs Related Standards

Standard	Relationship to NIST 800-53	Primary Audience
NIST 800-171	Subset of 800-53 controls for CUI	Defense contractors
FedRAMP	Uses 800-53 baselines for cloud	Cloud service providers
DISA STIGs	Technical implementation of 800-53	DoD system administrators
CMMC	Builds on 800-171 controls	Defense industrial base

Implementation for Defense Contractors

Defense contractors seeking Authority to Operate (ATO) must demonstrate implementation of applicable NIST 800-53 controls through the Risk Management Framework (RMF) process:

Categorize the information system based on impact levels
Select appropriate control baseline and tailor to requirements
Implement controls with documented procedures
Assess control effectiveness through testing
Authorize system operation based on risk acceptance
Monitor controls continuously post-authorization

Alterra's Approach

At Alterra Solutions, our systems are architected with NIST 800-53 High baseline controls as the default. For air-gapped deployments, we provide complete control implementation documentation suitable for ATO packages, including:

System Security Plan (SSP) templates
Control implementation statements
Plan of Action and Milestones (POA&M) tracking
Continuous monitoring procedures