NIST 800-171 Compliance Assessment Services

NIST 800-171 Compliance Assessment Services

Protect Controlled Unclassified Information (CUI) and demonstrate compliance with NIST SP 800-171 requirements.

Organisations that store, process or transmit Controlled Unclassified Information (CUI) for the U.S. Department of War (DoW) and other federal agencies must implement robust cybersecurity controls. For organisations working on, or looking to work on, federal contracts, NIST SP 800-171 is a mandated requirement. Compliance demonstrates that the required controls have been implemented to safeguard sensitive information and meet contractual and regulatory obligations.

NSF works with organisations to understand, assess and strengthen their cybersecurity posture through comprehensive NIST SP 800-171 assessment and gap assessment services. Whether you are preparing for a DoW assessment, supporting CMMC requirements or improving your information security programme, our experts can work with you to navigate your way through the process.

What is NIST SP 800-171?

NIST Special Publication (SP) 800-171 is a cybersecurity framework developed by the National Institute of Standards and Technology (NIST) to protect Controlled Unclassified Information (CUI) within non-federal systems and organisations. First published in 2015, the framework establishes 110 security requirements across 14 control families designed to safeguard sensitive information from unauthorized access, disclosure or loss.

NIST SP 800-171 has become a critical requirement for organisations that support the Defense Industrial Base (DIB) and federal supply chains. Compliance demonstrates that your organisation has implemented appropriate security controls to protect government information.

Who needs to comply with NIST SP 800-171?

Your organisation could need to comply with NIST SP 800-171 if you:

• Handle, process, store or transmit Controlled Unclassified Information (CUI).
• Support contracts with the U.S. Department of Defense (DoW).
• Operate within the Defense Industrial Base (DIB).
• Work with federal agencies such as NASA, GSA and other government entities.
• Are preparing for Cybersecurity Maturity Model Certification (CMMC) requirements.

Compliance is increasingly becoming a prerequisite for contract eligibility and continued participation in government supply chains.

What is the relationship between NIST SP 800-171 and CMMC?

NIST SP 800-171 Rev 2 forms the foundation of the Cybersecurity Maturity Model Certification (CMMC) framework. Organisations pursuing CMMC Level 2 must demonstrate compliance with the 110 security requirements and 320 assessment objectives defined by NIST SP 800-171 Rev 2.

Because of this close relationship, a strong NIST SP 800-171 compliance programme can help organisations prepare for future CMMC assessments and reduce certification risks. Learn more about CMMC. 

Why is NIST SP 800-171 compliance considered more than a cybersecurity requirement?

For organisations supporting the Defense Industrial Base, compliance with NIST SP 800-171 is not simply a contractual obligation. Increasingly, it represents a significant legal and financial risk area for government contractors and subcontractors.

The U.S. Department of Justice's Civil Cyber-Fraud Initiative uses the False Claims Act to pursue organisations that knowingly misrepresent their cybersecurity posture or claim compliance to NIST SP 800-171 requirements while failing to fully implement required controls.

As government scrutiny increases, organisations must be able to demonstrate that cybersecurity requirements have been objectively assessed, documented, and implemented. By providing independent assessment expertise, NSF can work with organisations to build a more defensible compliance position while supporting the protection of Controlled Unclassified Information (CUI) throughout the defense supply chain.

What are the NIST SP 800-171 assessment requirements?

The Department of War requires contractors handling CUI to assess and document their implementation of NIST SP 800-171 controls. Assessment results are required to be submitted to the Supplier Performance Risk System (SPRS) to support contract eligibility and award decisions.

An effective assessment evaluates:

• Current implementation of NIST SP 800-171 security controls.
• Gaps and areas of nonconformity.
• System Security Plan (SSP) documentation.
• Plans of Action and Milestones (POA&M).
• Organisational readiness for customer or regulatory reviews.
• Alignment with CMMC requirements.

What is NSF's NIST SP 800-171 gap assessment service?

Understanding your current cybersecurity maturity is the first step toward compliance.

NSF's NIST SP 800-171 Gap Assessment service provides an independent evaluation of your information security programme against framework requirements. Our experienced cybersecurity professionals identify areas requiring attention and provide practical recommendations to support your compliance journey.

Benefits of a gap assessment

• Identify compliance gaps before formal assessments
• Prioritize remediation activities
• Improve protection of Controlled Unclassified Information (CUI)
• Reduce risk across your organisation
• Strengthen readiness for CMMC and customer assessments
• Build confidence in your cybersecurity programme.

Trusted information security expertise

NSF combines extensive experience in management systems auditing with deep cybersecurity knowledge, helping organisations strengthen security and achieve compliance objectives.

Experienced assessors

Our professionals possess expertise across cybersecurity, risk management and internationally recognized management system standards, delivering practical and business-focused guidance.

Support beyond NIST SP 800-171

NSF provides a broad portfolio of information security and management systems services, including:

• CMMC (NSF is an accredited C3PAO for CMMC)
• ISO/IEC 27001
• ISO/IEC 20000-1
• CSA STAR

This enables organisations to align multiple compliance and certification objectives through a single trusted provider.

Global reputation and trust

Organisations worldwide rely on NSF to help improve performance, reduce risk and demonstrate commitment to security, quality and compliance.

Start your NIST SP 800-171 compliance journey

Whether you are preparing for DoW requirements, strengthening information security controls or building readiness for CMMC, NSF can help – no matter whether your business is small or large.