NIST SP 800-171 Gap Assessment
NIST SP 800-171 gap assessment for clearer CUI remediation priorities
Understand where protection of controlled unclassified information falls short of your contract's requirements. ICA's scoped review connects control gaps to system security plan recommendations and remediation planning support.
MIS
CISSP
CHISL
CPHIMS
CDH-E
Will Long Sr. · Founder
MIS · CHISL · CDH-E · CISSP · CPHIMS
Nearly 40 years in IT & cybersecurity
Former VP & CISO, Children’s Health System of Texas
Tim Pelikan · Co-Founder
Credential details pending confirmation
30 years in cybersecurity & data risk
Interviews & industry conversations
Coffee With Closers
Cybersecurity With Discern
“ICA provides distinctive security professionals who excel at building strong client relationships, demonstrate exceptional organization, and deliver practical, risk-based consulting recommendations to our clients.”
Michael Cox, CIPP/US
Chief Privacy Consultant & Founder, SoCal Privacy Consultants
Partner endorsement of ICA’s advisory work
Plan CUI improvements around your contract
A contract introduces safeguarding requirements, or a customer asks how you protect controlled unclassified information (CUI). Your compliance lead needs to explain the gaps while your CISO decides which changes deserve attention first.
This assessment supports government contractors and defense suppliers making those decisions. It compares the agreed environment with the NIST SP 800-171 requirements applicable to the customer. Findings help your team separate control weaknesses from missing evidence and plan the work needed to address them.
Define the CUI boundary before reviewing controls
Scope starts with where CUI is processed, stored or transmitted, together with the systems that protect those activities. Relevant context can include contractor workflows, user access, endpoints and service-provider responsibilities. A narrowly described enclave still needs a clear account of its supporting dependencies.
Agree the required revision and evidence depth before the review begins. The newest NIST publication is not automatically the version required by every contract. Your contract owner helps establish the obligations; security and IT owners explain the environment. Any excluded systems or unresolved boundary questions should remain visible in the assessment.
Connect control claims to supporting evidence
The proposed review combines stakeholder interviews with examination of relevant documentation and control evidence. Materials may include policies, system diagrams, access records and prior assessment findings. Discussions with control owners clarify how documented safeguards operate in the CUI environment.
NIST assessment guidance distinguishes examination, interviews and testing. This engagement's methods and coverage are agreed during scoping. Reviewing a configuration record does not mean ICA has tested the live system. Vulnerability scanning and authorized penetration testing require separately defined scope. Missing or incomplete evidence is recorded rather than treated as proof that a safeguard works.
Use findings to improve the SSP and remediation plan
Typical outputs are defined in the engagement scope:
Control gap assessment. Understand the identified shortfalls against agreed requirements and the evidence supporting each finding. Leadership can use this assessment to discuss priorities with control owners.
System security plan recommendations. The system security plan (SSP) describes the scoped environment and its security protections. Recommendations help your team address unclear boundaries or control descriptions that do not reflect available evidence.
Remediation and POA&M support. Planning support helps organize corrective actions for identified gaps. A plan of action and milestones (POA&M) gives owners a way to track planned improvements; any permitted use depends on applicable requirements.
Agree how much documentation support is needed. Recommendations do not imply delivery of a completed replacement SSP or acceptance of unresolved findings by a customer.
Prepare contract context and control owners
Engagement cost and timing depend on the CUI boundary, applicable revision and required evidence depth. Multiple environments, shared responsibilities and incomplete documentation can increase the work needed to establish findings.
Identify a contract owner and people responsible for the relevant safeguards. Prepare existing boundary documentation, your SSP if available, and prior remediation records. Agree evidence access and appropriate handling arrangements before sharing sensitive material. The client helps clarify responsibilities and resolve factual questions. Confirm the assessment package and delivery capacity before committing to an engagement.
Keep advisory findings separate from formal acceptance
This is a scoped gap assessment with documentation recommendations and remediation planning support. It does not provide government approval or guarantee an assessment score. Your organization remains responsible for implementing improvements and meeting its contractual obligations.
CMMC readiness addresses the applicable program and contract requirements as a distinct offering. This review focuses on the agreed NIST SP 800-171 gaps. Formal certification assessment, technical testing and remediation execution need their own arrangements; none should be inferred from a gap-assessment report.
Questions about a NIST SP 800-171 gap assessment
Who is this assessment for?
Government contractors and defense suppliers that need to understand CUI safeguarding gaps. It is useful when a compliance lead and security team need a shared basis for documentation improvements and remediation decisions.
Will the review cover our entire company?
Coverage follows the agreed CUI boundary and supporting systems. Scoping identifies relevant workflows and dependencies, then records exclusions. A limited review should not be presented as an assessment of every system in the company.
How are findings supported?
Interviews and evidence examination connect control descriptions to supporting records. The agreed assessment approach determines sample depth and whether any separately authorized testing is needed. Conclusions should reflect the evidence actually reviewed.
What determines cost and timing?
The applicable revision, environment complexity and evidence depth shape the effort. Availability of documentation and control owners also matters. Those details need to be established before price or a delivery schedule can be confirmed.
Does this include CMMC certification?
CMMC readiness and formal certification assessment have separate purposes and requirements. This NIST SP 800-171 gap assessment provides scoped findings and planning support. It does not issue CMMC certification or replace an applicable formal assessment.
Will ICA fix the findings or write a full SSP?
The catalog includes SSP recommendations and remediation or POA&M support. The engagement defines the extent of that support. Implementation and complete document development should be expressly agreed rather than assumed included.
Clarify the gaps before committing resources
Bring your contract requirements and current understanding of the CUI boundary into a scope discussion. Define a review that helps your team explain control gaps, improve the SSP and set workable remediation priorities.
Plan CUI improvements around your contract
A contract introduces safeguarding requirements, or a customer asks how you protect controlled unclassified information (CUI). Your compliance lead needs to explain the gaps while your CISO decides which changes deserve attention first.
This assessment supports government contractors and defense suppliers making those decisions. It compares the agreed environment with the NIST SP 800-171 requirements applicable to the customer. Findings help your team separate control weaknesses from missing evidence and plan the work needed to address them.
Define the CUI boundary before reviewing controls
Scope starts with where CUI is processed, stored or transmitted, together with the systems that protect those activities. Relevant context can include contractor workflows, user access, endpoints and service-provider responsibilities. A narrowly described enclave still needs a clear account of its supporting dependencies.
Agree the required revision and evidence depth before the review begins. The newest NIST publication is not automatically the version required by every contract. Your contract owner helps establish the obligations; security and IT owners explain the environment. Any excluded systems or unresolved boundary questions should remain visible in the assessment.
Connect control claims to supporting evidence
The proposed review combines stakeholder interviews with examination of relevant documentation and control evidence. Materials may include policies, system diagrams, access records and prior assessment findings. Discussions with control owners clarify how documented safeguards operate in the CUI environment.
NIST assessment guidance distinguishes examination, interviews and testing. This engagement's methods and coverage are agreed during scoping. Reviewing a configuration record does not mean ICA has tested the live system. Vulnerability scanning and authorized penetration testing require separately defined scope. Missing or incomplete evidence is recorded rather than treated as proof that a safeguard works.
Use findings to improve the SSP and remediation plan
Typical outputs are defined in the engagement scope:
Control gap assessment. Understand the identified shortfalls against agreed requirements and the evidence supporting each finding. Leadership can use this assessment to discuss priorities with control owners.
System security plan recommendations. The system security plan (SSP) describes the scoped environment and its security protections. Recommendations help your team address unclear boundaries or control descriptions that do not reflect available evidence.
Remediation and POA&M support. Planning support helps organize corrective actions for identified gaps. A plan of action and milestones (POA&M) gives owners a way to track planned improvements; any permitted use depends on applicable requirements.
Agree how much documentation support is needed. Recommendations do not imply delivery of a completed replacement SSP or acceptance of unresolved findings by a customer.
Prepare contract context and control owners
Engagement cost and timing depend on the CUI boundary, applicable revision and required evidence depth. Multiple environments, shared responsibilities and incomplete documentation can increase the work needed to establish findings.
Identify a contract owner and people responsible for the relevant safeguards. Prepare existing boundary documentation, your SSP if available, and prior remediation records. Agree evidence access and appropriate handling arrangements before sharing sensitive material. The client helps clarify responsibilities and resolve factual questions. Confirm the assessment package and delivery capacity before committing to an engagement.
Keep advisory findings separate from formal acceptance
This is a scoped gap assessment with documentation recommendations and remediation planning support. It does not provide government approval or guarantee an assessment score. Your organization remains responsible for implementing improvements and meeting its contractual obligations.
CMMC readiness addresses the applicable program and contract requirements as a distinct offering. This review focuses on the agreed NIST SP 800-171 gaps. Formal certification assessment, technical testing and remediation execution need their own arrangements; none should be inferred from a gap-assessment report.
Questions about a NIST SP 800-171 gap assessment
Who is this assessment for?
Government contractors and defense suppliers that need to understand CUI safeguarding gaps. It is useful when a compliance lead and security team need a shared basis for documentation improvements and remediation decisions.
Will the review cover our entire company?
Coverage follows the agreed CUI boundary and supporting systems. Scoping identifies relevant workflows and dependencies, then records exclusions. A limited review should not be presented as an assessment of every system in the company.
How are findings supported?
Interviews and evidence examination connect control descriptions to supporting records. The agreed assessment approach determines sample depth and whether any separately authorized testing is needed. Conclusions should reflect the evidence actually reviewed.
What determines cost and timing?
The applicable revision, environment complexity and evidence depth shape the effort. Availability of documentation and control owners also matters. Those details need to be established before price or a delivery schedule can be confirmed.
Does this include CMMC certification?
CMMC readiness and formal certification assessment have separate purposes and requirements. This NIST SP 800-171 gap assessment provides scoped findings and planning support. It does not issue CMMC certification or replace an applicable formal assessment.
Will ICA fix the findings or write a full SSP?
The catalog includes SSP recommendations and remediation or POA&M support. The engagement defines the extent of that support. Implementation and complete document development should be expressly agreed rather than assumed included.
Clarify the gaps before committing resources
Bring your contract requirements and current understanding of the CUI boundary into a scope discussion. Define a review that helps your team explain control gaps, improve the SSP and set workable remediation priorities.