NIST 800-53 vs. NIST 800-171: What’s The Difference?

Despite having similar designs and goals, there is one key difference between NIST 800-53 and NIST 800-171: NIST 800-53 is a mandatory compliance standard for federal information systems, agencies, and contractors that work with the United States government. NIST 800-171, on the other hand, is a mandatory compliance standard for non-federal systems that handle Controlled Unclassified Information (CUI).

Continue reading to learn more about the similarities and differences between NIST 800-53 and NIST 800-171.

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NIST 800-53 vs 800-171 at a glance

• Same family: both are NIST cybersecurity standards providing security controls for a baseline level of IT and information systems security.
• 800-53 = federal: NIST 800-53 is mandatory for federal information systems, agencies and government contractors.
• 800-171 = CUI: NIST 800-171 is mandatory for non-federal systems that handle Controlled Unclassified Information (CUI).
• Shared approach: both take a risk-based approach and use security control families.

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NIST 800-171 overview

NIST 800-171 establishes guidelines for protecting sensitive information on the IT systems and networks of federal contractors. Through mandating top-tier cybersecurity practices for government contractors, the overall resilience of the federal supply chain is bolstered. NIST 800-171 focuses on safeguarding CUI to ensure that such sensitive data stored on contractors’ networks remains secure.

NIST 800-53 overview

NIST 800-53 is a security compliance standard designed to secure the information and IT systems of federal agencies. The standard provides guidelines to secure any part of a federal information system that stores, processes, or transmits federal information. NIST 800-53 is also concerned with ensuring the safeguarding of classified data within federal systems.

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The two standards

• NIST 800-171: sets guidelines for protecting sensitive information on federal contractors’ systems and networks, focused on safeguarding CUI.
• NIST 800-53: secures the information and IT systems of federal agencies, including the safeguarding of classified data.
• Same aim: both bolster the security of systems that work with government data.

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NIST 800-53 vs. 800-171: Similarities

These two standards bear many similarities. These include:

• Both are frameworks that provide security standards for systems and organisations that work with government data.
• Both standards take a risk-based approach and utilise security control families.
• The controls used by each are designed to address various cybersecurity aspects, like access control, incident response, risk assessment, and system monitoring.

NIST 800-53 vs. 800-171: Differences

There are also some key differences between these two standards. These include:

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In Hicomply’s experience

Which standard applies comes down to your relationship to government data — contractors handling CUI need 800-171, federal systems need 800-53 — but the control families overlap heavily. Build the controls once and reuse the evidence rather than running two projects. An ISO 27001 ISMS gives you a risk-based backbone that maps onto both.

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Learn more about NIST compliance standards

If you want to learn more about NIST standards and compliance, you can find more information in our NIST 800-53 information hub. Or, contact us today to learn more about how Hicomply can help you reach compliance standards.