Building a CUI Enclave for Defense Manufacturing
A CUI enclave is a deliberately bounded environment where controlled unclassified information is stored, processed, and transmitted, isolated so that the rest of your business does not fall inside the NIST SP 800-171 and CMMC assessment scope. For a defense manufacturer, the alternative is applying 110 security requirements to every laptop, server, and shop floor system you own, which is far more expensive and slower to certify. The hard part is not the technology. It is deciding where controlled unclassified information genuinely lives, which almost always includes parts of your ERP. This guide covers scoping, architecture, and the ERP decision.
Scoping: What Actually Belongs in the Enclave
Under CMMC scoping guidance, assets fall into categories: assets that handle controlled unclassified information, security protection assets, contractor risk managed assets, specialized assets such as operational technology and test equipment, and out-of-scope assets. Start by tracing the data. In most defense manufacturers the true controlled unclassified information is engineering data: customer drawings, specifications, technical data packages, and the derived work instructions and inspection plans. Purchase orders and contract line items may carry markings as well. Map every place a drawing lands, including engineers' desktops, the email system, the quality lab, the CMM programming station, and the machine tool that receives a part program.
- Trace controlled unclassified information from customer receipt through engineering, planning, production, and archive
- Categorize every asset into CUI, security protection, contractor risk managed, specialized, or out of scope
- Document the data flow diagram and asset inventory; assessors examine these before anything else
- Identify the machine tools and inspection systems that receive technical data, since these are specialized assets
Reference Architecture for a Manufacturing CUI Enclave
A practical enclave uses a separate identity and collaboration tenant, commonly Microsoft 365 GCC High for organizations with ITAR-controlled data, plus a segmented network zone and virtual desktops as the primary access method. Virtual desktops matter because they keep controlled data off endpoints, which shrinks the number of assets in scope dramatically. Inside the enclave sit the document repository or PLM vault, the engineering applications, and whatever ERP components handle marked data. Access requires FIPS-validated cryptography, multi-factor authentication, and verification that the user is a US person where ITAR applies. Everything else, including general email, HR, and finance, stays outside.
The ERP Question: In Scope or Not
This is where most defense manufacturers stall. If your SyteLine, LN, or M3 system stores marked drawings as attachments, holds customer technical requirements in text fields, or exposes part numbers that are themselves controlled under contract, the ERP is in scope. Three viable strategies exist. First, bring the whole ERP into the enclave, which is clean but expands scope and cost. Second, keep controlled data out of the ERP entirely by moving all documents to an enclave-hosted repository and referencing them from ERP by pointer only. Third, split the ERP with a dedicated instance for defense programs. Option two is usually the best value and takes four to nine months.
- Audit ERP attachments and free-text fields for marked content before assuming the ERP is out of scope
- Replace document storage in ERP with pointers to an enclave-hosted repository or PLM vault
- Restrict ERP exports and report distribution that could push controlled data into unprotected mailboxes
- Record the scoping decision and its rationale in the system security plan, since assessors will challenge it
Documentation, SPRS, and Assessment Readiness
The artifacts carry as much weight as the technology. You need a system security plan describing how each of the 110 requirements in NIST SP 800-171 is met within the enclave boundary, a plan of action and milestones for anything not yet implemented, a current self-assessment score submitted to the Supplier Performance Risk System, and supporting evidence for every control. The maximum score is 110, and many manufacturers submit negative scores because certain requirements carry heavier deductions. For CMMC Level 2 with a third-party assessment, allow nine to eighteen months from a serious start, and expect evidence collection to consume more calendar time than the technical build.
How Netray Builds Defense-Ready ERP and Enclaves
Netray works where enclave design meets ERP reality, which is exactly where generic compliance firms hand you a policy binder and leave. Our AI agents scan SyteLine, LN, or M3 attachments, custom fields, and report outputs for markings and controlled content, producing a defensible in-scope or out-of-scope determination with evidence rather than assumption. We then implement the separation: pointer-based document architecture, restricted export paths, tightened ERP role design, and audit logging mapped to the NIST SP 800-171 audit and accountability family. Clients typically remove 60 to 80 percent of previously in-scope ERP assets from the assessment boundary, which lowers both cost and risk.
Frequently Asked Questions
What is a CUI enclave and why build one?
A CUI enclave is an isolated environment where controlled unclassified information is stored and processed, separated from the rest of your network by identity, network, and access controls. Building one limits the number of systems subject to the 110 requirements in NIST SP 800-171 and to a CMMC assessment. For most small and mid-size defense manufacturers, an enclave is significantly faster and cheaper than certifying the entire enterprise.
Is my ERP system in scope for CMMC?
It depends on whether the ERP stores, processes, or transmits controlled unclassified information. If marked drawings are attached to work orders, if customer technical requirements sit in text fields, or if contract-controlled part identifiers are exposed, the ERP is in scope. Many manufacturers reduce scope by moving documents to an enclave-hosted repository and keeping only unmarked references in the ERP, then documenting that decision in the system security plan.
How long does it take to build a CUI enclave?
The technical build for a virtual desktop based enclave with a separate tenant, segmented network, and document repository typically runs three to six months for a mid-size manufacturer. Reaching assessment readiness including the system security plan, evidence collection, remediation of gaps, and a CMMC Level 2 third-party assessment usually takes nine to eighteen months from a serious start with dedicated ownership.
Key Takeaways
- 1Scoping: What Actually Belongs in the Enclave: Under CMMC scoping guidance, assets fall into categories: assets that handle controlled unclassified information, security protection assets, contractor risk managed assets, specialized assets such as operational technology and test equipment, and out-of-scope assets. Start by tracing the data.
- 2Reference Architecture for a Manufacturing CUI Enclave: A practical enclave uses a separate identity and collaboration tenant, commonly Microsoft 365 GCC High for organizations with ITAR-controlled data, plus a segmented network zone and virtual desktops as the primary access method. Virtual desktops matter because they keep controlled data off endpoints, which shrinks the number of assets in scope dramatically.
- 3The ERP Question: In Scope or Not: This is where most defense manufacturers stall. If your SyteLine, LN, or M3 system stores marked drawings as attachments, holds customer technical requirements in text fields, or exposes part numbers that are themselves controlled under contract, the ERP is in scope.
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