CUI enclaves in CMMC compliance: Are they right for your business?

CUI enclaves for CMMC compliance - A decision-making guide for small IT teams

by Mustafa Mukhtar, MBA, ITIL
Consultant/Content Contributor, E-N Computers
20+ years of experience in IT management, project planning, enterprise systems and user support

Updated July 22, 2026

CUI enclaves can simplify CMMC compliance. By isolating Controlled Unclassified Information in a secure environment, enclaves can reduce risk and narrow your compliance scope. But they aren’t right for every organization.

The right answer depends on who handles CUI, how contained your workflows are, and whether you can enforce strict access. The 17-question decision tool below scores your readiness.

CMMC Phase 1 took effect November 10, 2025, and self-assessment requirements remain in force. Phase 2 — the third-party certification requirement that was set to start November 10, 2026 — is on hold. The Department of War suspended it on July 13, 2026, while a task force spends 60 days reviewing the program. That pause doesn’t touch your legal obligation to protect CUI under DFARS 252.204-7012, so compliance planning still matters. Your contracts will determine when and how certification applies to you once the review wraps up.

A CUI enclave is a segregated IT environment designed to contain and protect CUI. Instead of applying strict security requirements across an entire organization, an enclave limits CUI access to a specific system or group of users. A CUI enclave is not a one-size-fits-all solution. It requires careful planning, implementation, and ongoing maintenance to meet compliance requirements.

QUICK ANSWER:

Is a CUI enclave the fastest way to achieve CMMC compliance?

It can be — especially if only a small group handles your CUI and you go with a cloud-based or turnkey option. For complex operations or heavy collaboration, an enclave may not be the right fit. Third-party certification is on hold while the Department of War reviews the CMMC program, but the requirement to protect CUI hasn’t gone anywhere. It’s worth picking the option that keeps you compliant long-term, not just the one that’s fastest to set up now.

How businesses are setting up enclaves
When CUI enclaves work best
When a CUI enclave won’t work
CUI Enclave Decision Tool
Common misconceptions about CUI enclaves
Major implementation challenges with CUI enclaves
Next steps

How businesses are setting up enclaves

Here are the most common ways organizations are implementing enclaves today:

Virtual desktop infrastructure (VDI)

With a virtual desktop infrastructure, users access a secure, isolated desktop environment where CUI is processed and stored. This approach centralizes security and simplifies compliance.

VDI solutions like Citrix or VMware Horizon provide a safe, remote desktop environment where CUI is processed and stored. Users access the VDI from their endpoint devices, but all data remains in the controlled virtual environment, reducing compliance scope. VDI is ideal for businesses needing centralized security and remote workforce support.

For more details on using VDI for CMMC compliance, see our article Azure Virtual Desktop enclaves aren’t a compliance silver bullet – here’s why.

On-premises secure server

An on-premises secure server is a dedicated, physically separated network segment, often with physically isolated or firewall-isolated servers with restricted access. With this approach, CUI remains isolated from general IT operations. Physical security measures, such as badge access and surveillance, further restrict unauthorized access. This works best for organizations with high security needs and existing on-prem infrastructure.

Microsoft GCC High & AWS Gov Cloud

Microsoft and AWS offer cloud-based enclave solutions that provide preconfigured government-compliant security controls, eliminating the need for on-prem infrastructure and reducing maintenance overhead. Either is a strong option for businesses already leveraging cloud services or with distributed teams. Businesses needing to achieve CMMC quickly can deploy a fully cloud-hosted enclave.

GCC High is often used as an enclave platform, but it is not the only enclave option. Organizations can build compliant enclaves using virtual desktop infrastructure, on-premises environments, AWS GovCloud, or specialized third-party solutions. The right choice depends on how broadly CUI is used throughout the business, available IT resources, and long-term compliance goals.

If you’re evaluating GCC High specifically, see our guide: “Do I need GCC High for CMMC? What it really costs – and who can skip it“.

Third-party enclave providers

Some vendors offer pre-built enclave solutions — Cuick Trac provides a hosted virtual enclave, while PreVeil takes an overlay approach, adding encrypted email and file storage on top of your existing systems.

These solutions come with the security features you need — encrypted storage, role-based access, audit logs — already set up. That saves time and reduces the need for in-house security expertise.

But a turnkey enclave doesn’t make you compliant. You still have to configure it correctly, train your users, document your security program, and define your assessment boundary — and you’re the one who has to prove all of it during an assessment. And these tools add friction: separate logins, separate storage, new habits for everyone who touches CUI. If the setup is enough of a pain, people will work around it, and a workaround puts CUI right back outside your boundary.

Also worth checking before you sign: who owns your data, what the subscription costs as you grow, and how hard it would be to leave.

Comparing CUI Enclave Deployment Options

Type of enclave	VDI	On-Premises	Cloud	3rd-Party
Primary Benefit	Centralized, secure remote access	Full physical control and isolation	Fast deployment with prebuilt compliance features	Fast, simplified setup with minimal in-house effort
Ideal For	Remote teams, info workers, centralized workflows	Organizations with high internal IT resources	Businesses needing quick compliance, cloud-ready environments	Small teams without IT staff, looking for a turnkey solution
Setup & Deployment	Moderate setup time, depends on vendor and internal infrastructure	Longest setup time, complex planning	Fastest if already using Microsoft or AWS ecosystem	Very fast – typically plug-and-play
Maintenance	Requires in-house or managed IT support	Fully managed in-house	Managed by cloud provider	Managed by vendor with optional support contracts
Cost Profile	Moderate to high – includes licenses and possible duplication of systems	High upfront investment; lower recurring cost	Subscription-based; predictable monthly cost	Subscription or bundled cost; may rise with user count or features
Customization	High, especially with internal IT staff	Very high – full control of stack	Moderate – depends on provider and services selected	Low – fixed feature sets, limited ability to customize
Security Considerations	Data stays in secure hosted environment, limited risk if configured properly	Strong physical/logical control; high responsibility	High compliance standards; inherits provider’s certifications	Vendor-managed security; some risk with shared infrastructure
IT Expertise Needed	Moderate – need to manage sessions, identity, policies	High – full ownership of configuration and updates	Low to moderate – depends on vendor involvement	Low – designed for non-technical teams

When CUI enclaves work best

Knowing whether any of these CUI enclave options are the right fit for you depends on how your business handles sensitive data, how your teams work, and how much control you have over users and systems.

Example use cases that fit well with enclaves would include:

software development teams using secure code repositories
CAD modeling workflows where design files remain within the enclave
professional services firms (legal, accounting, consulting) handling sensitive client data.

We’ll break down why these types of businesses are a good fit. Here are four business settings where enclaves tend to work well.

CUI is limited to a small subset of users

If only a handful of employees handle CUI, an enclave can isolate that data and reduce the compliance scope. Remember, you’re not isolating CUI to a specific machine — you’re isolating it to specific people. An enclave depends more on who has access than where the data resides.

You’re not isolating CUI to a specific machine — you’re isolating it to specific people. An enclave depends more on who has access than where the data resides.

For example, a company is a 10-person CNC machine shop where only two employees handle DoD contracts involving CUI. They’ve built a basic enclave using a secure cloud workspace that only those two staff members can access. Because CUI is handled by a small, well-defined group, the enclave approach is effective and efficient for them.

The business has well-defined workflows

If CUI can be neatly contained within specific applications or processes, an enclave simplifies security management. Consistent workflows make it easier to maintain compliance boundaries.

Employees are mostly information technology workers

Engineers, consultants, and software developers — who perform most of their work at a computer can adapt more easily to the remote-access models enclaves often require.

You can strictly control access

Organizations that can tightly control and enforce who accesses CUI benefit most from an enclave approach. The technology is only as secure as the access policies and training of the people who use it. Enclave users often need to be tech-savvy, capable of managing multi-step login processes and navigating remote or virtual desktop environments.

When an enclave won’t work

In some cases, trying to implement an enclave can add more complexity than it solves. Here are situations where an enclave may not be the best option.

CUI is everywhere in your daily work

If your CUI is spread across departments, email threads, and shared drives, walling it off gets hard. A mid-sized aerospace supplier, for example, might have engineers, sales, procurement, and customer service all handling CUI — technical drawings, quotes, customer emails. When CUI runs through that much of your business, carving it into a separate enclave can cost more than it saves.

You have to collaborate

If your team regularly shares CUI with outside partners or across departments, an enclave can slow things down and get in the way.

You’re a single-person business or small manufacturer

Small teams handling CUI directly in core operations (e.g., machine shops) may find a full organizational approach simpler than trying to isolate CUI into a separate enclave.

CUI Enclave Decision Tool

See if a CUI enclave makes sense for you

Answer 17 questions, designed by IT pros, and view your results instantly — no email required.

Enclaves are complicated. But deciding if one will work for you doesn’t have to be.

Try the Enclave decision tool

Common misconceptions about CUI enclaves

While they can be powerful tools, there are several misconceptions about what enclaves do, how much they cost, and how easily they can fit into existing business operations. Let’s break down a few of the most common myths.

“CUI enclaves always reduce compliance costs.”
Not necessarily. While an enclave can reduce the number of systems and users that fall under the scope of CMMC compliance, it often introduces new layers of cost and complexity, including:

Initial setup – Building a secure enclave (whether cloud or on-prem) requires investment in infrastructure, security controls, and implementation planning.
Ongoing operational adjustments – Employees must adapt workflows so that all CUI is processed, stored, and transmitted within the enclave. This often means learning new systems, switching applications, or following stricter processes. Maintaining the enclave requires continuous monitoring, maintenance, patching, and regular security audits.
Access management overhead – Enforcing access restrictions without interrupting business processes takes time and planning — especially in collaborative environments.
Compliance drift – If the enclave isn’t carefully integrated into business operations, users may revert to old habits that violate compliance boundaries. For example, a small aerospace parts supplier implemented a VDI-based enclave but failed to align it with their production floor workflows. Engineers and machinists found the system slow and cumbersome for accessing technical drawings, so they started saving files to USB drives or emailing them outside the enclave to keep projects moving or forwarding CUI-related files to personal email or downloading them onto non-compliant devices. This not only undermined compliance but increased the organization’s risk exposure.
Keeping up with CMMC – The rule is final, but the work isn’t. Assessment expectations and contract language will keep shifting, and the number of people who touch CUI in your business will probably grow too. Your enclave has to keep up with both. A rigid or poorly documented enclave is expensive to fix later — build something you can adjust, write down how it works, and make sure people actually use it.
Hidden costs – Many businesses underestimate the not-so-obvious costs of enclave adoption. For example, you’re effectively managing two environments – a secure enclave and your legacy IT systems — which can double infrastructure and support costs. Your licensing and subscriptions can add up quickly, particularly if you’re using turnkey solutions that bundle templates, automation tools, and cloud licenses. This can increase complexity, especially for organizations that lack the internal IT expertise to maintain a separate enclave and integrate it smoothly with existing operations.

In short, enclaves reduce compliance scope — but that doesn’t always mean they reduce your budget or your burden.

“An enclave fully solves CMMC compliance issues”

No. Even with an enclave, the rest of your IT infrastructure must still be protected against cyber threats. Plus, implementing an enclave doesn’t exempt a company from all CMMC requirements, only those specific to handling CUI. For example, a company using an enclave for CUI storage must still secure email systems to prevent phishing attacks targeting employees with access.

Major implementation challenges

Setting up a CUI enclave sounds straightforward, but the real-world execution can be tricky. Even with the right tools in place, it’s easy to make mistakes that lead to security gaps or extra work. Here are four common challenges that trip up organizations during implementation.

Scoping the enclave

You’ll need to define what data, systems, users, and workflows fall within the enclave. A poorly scoped enclave can lead to compliance gaps, duplicate work, or even a false sense of security.

One of the common scoping failures is misconfigured file sync tools. For example, some organizations use secure platforms like PreVeil but overlook that it syncs files to users’ local computers. While the cloud copy might meet CUI protection requirements, the synced local version may not — effectively placing sensitive data outside the secure boundary.

Another common scoping failure is ignoring peripheral users or systems. A company might believe it has secured its 20-person compliance team but fail to account for the 180 other employees who access, handle, or even view CUI through shared drives, emails, or collaborative tools. Without a clear definition of which users and devices are in or out of scope, you increase your attack surface — and your audit risk.

Boundary miscounting

Many organizations design an enclave around the people they know handle CUI but fail to identify everyone who actually touches it during normal business operations.

For example, a company may build an enclave for 10 engineering employees who work directly with controlled technical data. During an assessment, however, auditors discover that two purchasing employees routinely receive CUI through email or access controlled drawings outside the enclave. Those users, systems, and workflows may now fall within the assessment boundary.

This is one of the most common enclave planning mistakes. An enclave only reduces scope if all CUI processing, storage, and transmission remain inside the defined boundary.

Before implementing an enclave, organizations should carefully map who accesses CUI, where it’s stored, how it moves between departments, which external partners receive or exchange CUI, and which systems interact with CUI-related workflows.

If even a small number of users handle CUI outside the enclave, the compliance scope can expand significantly and create audit risk.

Many business owners assume that placing CUI into a secure platform automatically reduces scope. In reality, scope reduction depends on accurately identifying every person, device, workflow, and system that interacts with CUI. Poor boundary definition can eliminate many of the compliance and cost benefits an enclave was intended to provide.

Defining processes

You’ll need to separate business operations into CUI-related and non-CUI-related activities to keep CUI contained.

Access control & identity management

You’ll need to implement strict role-based access controls so only authorized users can access CUI.

Integration with existing IT Systems

You can’t move data in and out of the enclave without following security protocols to avoid accidental CUI exposure.

Next steps

If you’re considering a CUI enclave for CMMC compliance, here are some recommended next steps:

Assess your CUI scope: Identify where CUI exists in your organization and how it’s used.
Evaluate security needs: Determine whether an enclave or broader security approach is best for your workflows.
Develop an implementation plan: Define the architecture, access controls, and monitoring processes for your enclave.
Train employees: Educate staff about new processes and security requirements.
Monitor and adjust: Continuously assess and improve security measures to align with evolving CMMC regulations.
Consult compliance experts: Get help from your CMMC specialists to meet certification requirements.

Need help with CUI enclaves? Grab a complimentary consulting session to discuss your unique needs and explore whether a CUI enclave is the right solution for your business. As an MSP, MSSP, and CMMC compliance expert, E-N Computers has helped many businesses assess their IT environment and implement security strategies that meet compliance requirements.

We specialize in planning, building, and supporting CUI enclaves so they are properly scoped, securely configured, and fully integrated into your IT infrastructure.

Our team can help with:

Designing and implementing a secure enclave tailored to your business needs.
Managing and maintaining enclave security through ongoing monitoring and compliance updates.
Providing IT support and cybersecurity services beyond the enclave to protect your entire organization.
Guiding you through the CMMC certification process, guaranteeing readiness for audits and long-term compliance.

Complimentary review with an experienced engineer