CMMC Implementation for Foreign Countries: What International Defense Contractors Need to Know

July 27, 2026

The Cybersecurity Maturity Model Certification (CMMC) has fundamentally changed how organizations work with the U.S. Department of Defense (DoD). While many discussions focus on U.S.-based contractors, thousands of suppliers, manufacturers, engineering firms, and technology companies outside the United States also support the Defense Industrial Base (DIB).

If your organization is based in Canada, the United Kingdom, Australia, Europe, or another allied nation and handles Controlled Unclassified Information (CUI), you may also need to meet CMMC requirements.

The good news is that CMMC is not limited to U.S. companies. Foreign organizations can become CMMC certified, but there are several unique considerations surrounding assessments, data residency, cloud environments, and collaboration with U.S. prime contractors.

What is CMMC?

The Cybersecurity Maturity Model Certification (CMMC) is the Department of Defense’s cybersecurity verification program designed to protect Controlled Unclassified Information (CUI) throughout the Defense Industrial Base.

Organizations that process, store, or transmit CUI must demonstrate implementation of the 110 security requirements found in NIST SP 800-171. Rather than relying solely on self-attestation, many contractors must now undergo an independent assessment before receiving certain DoD contracts.

For most contractors, this means obtaining CMMC Level 2 certification, which verifies compliance with NIST SP 800-171 through a Certified Third-Party Assessment Organization (C3PAO).

The certification follows the information—not the company’s headquarters. If your organization handles CUI under a DoD contract, your geographic location does not exempt you from meeting CMMC requirements.

How Does CMMC Affect International Defense Contractors?

Foreign companies that handle Controlled Unclassified Information (CUI) under a DoD contract may need to become CMMC certified, just like U.S. based contractors.

Many international organizations are part of the U.S. Defense Industrial Base through:

• Aerospace manufacturing
• Defense engineering
• Advanced manufacturing
• Software development
• Electronics suppliers
• Research organizations
• Component manufacturers
• Logistics providers

If a U.S. prime contractor shares CUI with an international subcontractor, that subcontractor is generally expected to meet the same cybersecurity requirements as domestic suppliers.

Common examples include:

• Canadian aerospace suppliers
• UK defense engineering firms
• Australian defense manufacturers
• NATO partner organizations
• European technology providers supporting U.S. defense programs

The biggest challenge isn’t geography, it’s securely protecting CUI wherever it resides.

Can Foreign Companies Get CMMC Certification?

Yes. Foreign companies are eligible to obtain CMMC certification.

There is no requirement that a company be incorporated in the United States.

Instead, eligibility depends on whether the organization:

• Performs work supporting the Department of Defense
• Handles Controlled Unclassified Information (CUI)
• Meets the applicable CMMC requirements
• Successfully completes an assessment (when required)

However, foreign organizations often face additional implementation considerations, including:

• International data residency requirements
• Cross-border data transfers
• Secure collaboration with U.S. partners
• Identity management across organizations
• Selecting cloud services that satisfy both U.S. and local regulations

Organizations should also coordinate closely with their U.S. contracting partners to determine exactly what CMMC level is required for each contract.

Can a C3PAO Be Foreign Based for CMMC?

At present, most authorized C3PAOs operate within the United States, although assessments may be conducted internationally depending on the circumstances.

A foreign company seeking certification should work with an authorized C3PAO that is approved by the Cyber AB and experienced in assessing multinational environments.

Many assessments are performed remotely or through a combination of remote evidence review and onsite validation when necessary.

As the CMMC ecosystem continues to mature, more international assessment capabilities are expected to become available.

Step-by-Step Guide to CMMC Implementation for International Companies

Successfully implementing CMMC overseas follows many of the same steps as domestic organizations, but requires additional planning around cloud infrastructure, collaboration, and regulatory requirements.

Step 1: Determine Whether You Handle CUI

Start by identifying:

• What CUI you receive
• Where it resides
• Who accesses it
• Which systems process it
• Which subcontractors also receive it

Many organizations discover that only a small subset of employees actually require access to CUI.

Limiting the scope dramatically reduces both implementation complexity and certification costs.

Step 2: Define Your CMMC Assessment Boundary

One of the largest cost drivers in CMMC is the size of the assessment boundary.

Rather than placing your entire corporate Microsoft 365 tenant into scope, many international companies create an isolated CUI enclave.

This approach limits:

• Users
• Devices
• Storage
• Email
• Applications

A smaller boundary typically results in:

• Faster implementation
• Lower costs
• Simpler assessments
• Less disruption to the rest of the organization

Step 3: Perform a NIST 800-171 Gap Assessment

Evaluate your current environment against all 110 NIST SP 800-171 security requirements.

Typical gaps include:

• Multi-factor authentication
• Audit logging
• Access control
• Encryption
• Incident response
• Configuration management
• Security awareness training

Addressing these gaps before the assessment significantly improves readiness.

Step 4: Build Required Documentation

CMMC requires comprehensive documentation, including:

• System Security Plan (SSP)
• Policies and procedures
• Asset inventory
• Risk assessments
• Incident response plans
• Security training records
• Configuration baselines

Documentation should accurately reflect how your environment actually operates.

Step 5: Choose a CMMC-Compliant Collaboration Platform

International organizations frequently collaborate with:

• U.S. prime contractors
• Domestic subcontractors
• Engineering firms
• Government personnel

The collaboration platform should make secure external sharing straightforward without forcing every partner into the same tenant.

This is often where organizations encounter challenges with traditional government cloud environments.

Step 6: Complete Your C3PAO Assessment

Once implementation is complete, schedule an assessment with an authorized C3PAO.

During the assessment, auditors review:

• Technical controls
• Documentation
• Security processes
• Interviews
• Evidence demonstrating implementation

If successful, the organization receives its CMMC certification.

International CMMC Solutions

Selecting the right technology stack is one of the most important decisions during implementation. International organizations often need solutions that simplify secure collaboration across company and country boundaries while minimizing compliance costs.

PreVeil for International CMMC Compliance

For many small and midsize defense contractors, PreVeil provides one of the most practical paths to CMMC compliance.

Instead of requiring organizations to migrate their entire Microsoft 365 environment into a government cloud, PreVeil creates a secure, end-to-end encrypted enclave for CUI.

Advantages include:

• End-to-end encrypted email and file sharing
• Secure collaboration with external organizations
• Keeps existing Microsoft 365 or Google Workspace environments
• Dramatically reduces CMMC assessment scope
• Lower implementation costs
• Faster deployment
• Supports secure collaboration with international partners
• Trusted by more than 1,800 organizations handling sensitive information

For international suppliers that only need to protect a subset of users handling CUI, PreVeil can significantly reduce both cost and operational complexity compared to migrating an entire organization to a government cloud.

Best for: Small and midsize defense contractors looking to minimize CMMC scope while securely collaborating with U.S. customers and partners.

Microsoft GCC High

Microsoft GCC High remains a common choice for larger defense contractors that require a dedicated government cloud environment.

Benefits include:

• Microsoft government cloud
• Extensive Microsoft ecosystem
• Strong support for enterprise-scale deployments
• Wide adoption among large defense organizations

However, international organizations should carefully evaluate collaboration requirements.

One challenge is that external users who are not part of your GCC High tenant typically cannot collaborate as seamlessly as they would in commercial Microsoft 365. Organizations often need to provision guest accounts or establish more complex cross-tenant identity configurations for external partners. This can introduce additional administrative overhead, onboarding delays, licensing considerations, and a less intuitive collaboration experience, particularly when working with multiple international suppliers and customers.

GCC High is also significantly more expensive and usually requires migrating users, devices, and workflows into a separate environment, increasing both implementation effort and the overall CMMC assessment boundary.

Best for: Large defense contractors with complex Microsoft environments and dedicated IT resources.

Google Workspace with Assured Controls and Partner Solutions

Organizations standardized on Google Workspace may pair Google’s enterprise security capabilities with compliant partner solutions to help protect CUI.

This approach can work well for certain organizations but often requires additional third-party security controls and careful architectural planning to satisfy CMMC requirements.

Best for: Google-centric organizations with experienced security teams.

Kiteworks

Kiteworks provides secure file sharing and managed file transfer capabilities designed for organizations exchanging sensitive information with external parties.

Strengths include:

• Secure file transfers
• Audit logging
• External collaboration
• Compliance reporting

However, organizations typically need additional solutions for email security, endpoint protection, identity management, and broader CMMC compliance.

Best for: Enterprises with complex external file-sharing workflows.

Common Challenges for International Companies Pursuing CMMC

International organizations often encounter additional complexities that U.S.-based contractors may not face, including:

• Data sovereignty requirements
• Cross-border data transfers
• Identity federation across organizations
• Time zone differences during assessments
• Coordination with U.S. prime contractors
• International cloud architecture
• Language and documentation consistency

Planning for these considerations early can significantly reduce delays during implementation.

Frequently Asked Questions about International CMMC

Final Thoughts

CMMC is increasingly becoming a global cybersecurity requirement for organizations supporting the U.S. Department of Defense. Whether your business is located in Canada, the United Kingdom, Australia, Europe, or another allied nation, handling CUI means implementing the security controls necessary to protect sensitive defense information.

For international organizations, success often depends on minimizing the assessment boundary, selecting collaboration tools designed for cross-organizational work, and preparing thoroughly before engaging a C3PAO.

For small and midsize defense contractors, solutions like PreVeil offer a streamlined approach by securing only the users and data that handle CUI, helping organizations achieve compliance without the cost and complexity of migrating their entire IT environment. Book a demo.