NIST 800-171 SP Rev. 2 is the current cybersecurity standard required by CMMC compliance. However, with the release of revision 3, contractors need to be prepared for potential changes to their implementation in the future. Revision 3 introduces updated security requirements and Organizationally Defined Parameters (ODPs) that will influence future CMMC compliance, particularly in CMMC 3.0.
What is NIST 800-171?
NIST 800-171 SP (special publication) is the set of security standards, developed by NIST, to protect controlled unclassified information (CUI) in nonfederal systems. Revision 2 consists of 110 security requirements organized into 14 control "families" each addressing common and critical areas of cybersecurity.
NIST 800-171 exists because federal agencies routinely share sensitive but unclassified information with contractors. Without a consistent security baseline, that data becomes vulnerable once it leaves government-controlled systems. NIST 800-171 establishes that baseline by defining required security practices contractors must implement.
What Changed in NIST 800-171 Revision 3?
NIST 800-171 Rev. 3, at first glance, reduces the overall number of requirements for defense contractors from 110 to 97. However, this "decrease" represents a consolidation rather than a removal of security controls. Several controls have been merged providing more detail and curbing redundancy. Rev. 3 reorganizes and consolidates requirements, reducing the number of primary controls on paper. However, the total number of assessment objectives increases significantly, expanding the depth and scope of what organizations must implement and demonstrate. Revision 3 also adds several new control families moving from 14 to 17.
These new families include:
-
Planning (PL)
-
System and Service Acquisition (SA)
-
Supply Chain Risk Management (SR)
Revision 3 also includes the introduction of Organization Defined Parameters (ODPs). ODPs are values or conditions within certain security requirements that are not fully prescribed by NIST. Instead, the organization is responsible for defining them based on its environment, risk tolerance, and operational needs. In Rev. 3, ODPs identify places where specific values or conditions must be defined. For DoD contractors, DoD has now published defined ODP values for NIST SP 800-171 Rev. 3 in preparation for future implementation. Contractors should not assume they can freely choose every parameter without regard to DoD-defined values.
ODPs offer increased flexibility in how controls are implemented, but they also increase responsibility. Your organization must ensure these decisions are documented in the SSP and are prepared to justify them during an audit.
How Rev. 3 Changes the CMMC Landscape
As of now, revision 3 is not yet required for defense contractors. CMMC Level 2 certification is still based on the 110 controls defined in revision 2. However, focusing only on current requirements misses the bigger picture. The CMMC program is built on NIST 800-171, meaning that as NIST evolves the standard, CMMC will eventually need to reflect those changes. It is widely expected that future updates to CMMC will incorporate these revised requirements.
What this means for contractors
Even though Rev. 3 is not enforceable today, it introduces changes that will likely impact future certification efforts:
- Increased Requirements: While the number of controls may have "decreased" on paper, the number of "assessment objectives" have increased. Rev. 3 will expand the scope of what must be implemented to be considered compliant.
- Greater flexibility, but greater scrutiny: The inclusion of ODPs give organizations greater freedom in defining their own parameters. However, this requires organizations to justify those parameters and invites greater scrutiny.
- Greater emphasis on evidence: It will be harder to rely on “implemented” controls without strong documentation and justification.
Common Gaps Organizations Will Face
When moving from Rev. 2 to Rev. 3, there are several common gaps that can prevent organizations from demonstrating compliance readiness.
- Poorly defined ODP decisions: Organizations may define parameters (such as log retention or session timeouts) without a clear risk-based rationale, making them difficult to justify during an assessment.
- Incomplete asset inventory: Without a comprehensive and current inventory of systems, users, and data, organizations cannot accurately scope their environment or ensure all applicable controls are implemented.
- Poorly documented CUI flows: If CUI is not clearly tracked across systems and processes, it becomes difficult to define boundaries, apply controls consistently, and demonstrate compliance.
- Controls implemented but not provable: Organizations may have security controls in place, but lack the documentation, logging, or evidence required to demonstrate that those controls are operating effectively.
The Role of Managed Compliance
NIST 800-171 Rev. 3 introduces more flexibility and complexity particularly through ODPs. However, this can increase the burden on internal teams significantly. Many organizations pursuing CMMC compliance face challenges not because they lack tools, but because they lack the operational structure to sustain compliance over time.
A managed compliance approach shifts organizations from a project-based mindset to a continuous compliance model. This includes:
- Implementation support to align systems and controls with NIST 800-171 requirements
- Ongoing monitoring and management to ensure controls remain effective over time
- Documentation and evidence collection to support audit readiness
- Guidance on ODP decisions to ensure parameters are reasonable, consistent, and defensible
- Preparation for CMMC assessments, including SSP development and maintenance
CorpInfoTech, a Trusted CMMC Level 2 Partner
CorpInfoTech is a CMMC Level 2 certified MSP that helps defense contractors achieve and maintain compliance. Through a managed compliance approach, we guide organizations through the entire CMMC process; from initial scoping to ongoing audit readiness. This begins with defining your CUI boundary, establishing a clear system scope, and conducting a thorough gap assessment to identify compliance risks.
Unlike advisory-only providers, CorpInfoTech supports both strategy and execution. We implement the controls required to meet NIST 800-171 requirements and ensure your environment is prepared for a third-party assessment. As a certified provider, we can flow down more than 200 of the 320 CMMC Level 2 assessment objectives, reducing your audit scope and accelerating readiness.
Our approach is built on proven systems that streamline compliance while strengthening your ability to protect CUI. More importantly, we operate as an ongoing partner, not a one-time solution. After certification, we continue to monitor and maintain your compliance posture through structured reviews and continuous oversight, ensuring your organization remains aligned as requirements evolve.
As requirements continue to evolve, organizations that treat compliance as an ongoing operation, not a one-time project, will be better positioned to achieve and maintain CMMC certification.
Key Takeaways
- NIST SP 800-171 Rev. 3 is not required yet, but it is coming.
- Rev. 3 introduces more flexibility and more responsibility with the inclusion of ODPs
- Waiting to address Rev. 3 may increase future rework.
- Ongoing support for implementation, monitoring, and documentation can improve audit readiness and reduce the operational burden on internal teams.
Looking for a more efficient path to achieving and maintaining CMMC compliance? Connect with CorpInfoTech to see how a managed compliance model can reduce scope and ongoing burden.
CorpInfoTech, a Managed Service Provider (MSP) with over 25 years in the SMB space, is a trusted partner for business pursuing compliance and cybersecurity. We are a CMMC Level 2 (C3PAO) certified MSP and a Cyber AB Registered Provider Organization (RPO). Also, as the first CIS accredited organization, we help organizations implement the CIS controls as it pertains to CMMC and your overall cybersecurity posture. CorpInfoTech is your trusted partner for secure, compliant growth in every changing digital landscape.