Controlled Unclassified Information sits at the center of nearly every cybersecurity obligation in the defense industrial base. Whether you handle CUI determines if DFARS 252.204-7012 applies to your contracts, which CMMC level you need, and ultimately whether you remain eligible for DoD work, a reality that touches the roughly 337,000 prime contractors and subcontractors that make up the defense supply chain.

And the requirements keep evolving. CMMC requirements are being written directly into DoD contracts. A proposed FAR rule published in June 2026 would extend standardized CUI requirements to civilian contracts across the federal government, reaching organizations that have never faced formal cybersecurity obligations before. For contractors trying to keep up, understanding what CUI is, where it lives in their environment, and how to protect it has never mattered more.

At Secureframe, we're committed to helping defense contractors navigate these requirements with confidence. That's why we're excited to announce our new CUI Hub, a collection of 25+ free resources covering everything you need to know about identifying, handling, and safeguarding CUI in one place. Learn the fundamentals, classify your information against the official registries, scope your environment accurately, and find out whether a CUI enclave could shrink your compliance footprint.

New resources to simplify CUI compliance

CUI is one of the most commonly misunderstood concepts in defense contracting. Contractors regularly discover they've been handling it without realizing, or spend heavily protecting information that never required safeguarding. The rules span multiple regulations (32 CFR Part 2002, DoD Instruction 5200.48, and DFARS 252.204-7012), two federal registries, and a scoping exercise that determines the cost and complexity of everything downstream.

We built the CUI Hub as a one-stop resource to demystify all of it, with 25+ articles, reference tools, and downloadable checklists, plus original graphics and reference tables throughout. Our team of security and compliance experts added insights from their years of federal compliance experience, along with attributed guidance from the assessors and prime contractor leaders who spoke at the Secureframe National Cybersecurity Summit.

The Hub offers a self-guided learning experience. You can:

• Navigate sequentially to learn about CUI from the ground up
• Use the chapter navigation to jump directly to the topic you need
• Choose a learning path based on where you are in your CUI journey (Beginner, Intermediate, Advanced)
• Use the search bar on the Hub main page to quickly find answers to specific questions

What's inside the CUI Hub?

The CUI Hub is broken down into six main sections:

• CUI Fundamentals: Learn what CUI is, why the program exists, and the difference between CUI Basic and CUI Specified, the distinction that shapes how strictly information must be protected.
• CUI Categories: Explore real examples of CUI across the categories defense contractors encounter most, learn to navigate the ISOO and DoD CUI registries, and see where CUI ends and Federal Contract Information begins.
• Handling CUI: Understand who is responsible for protecting CUI and applying markings, the regulations that make those duties enforceable, how requirements flow down to subcontractors, and who can decontrol CUI.
• Scoping CUI: Find out how to determine whether you handle CUI, map how it flows through your environment, avoid the most common scoping mistakes, and keep your scope accurate as your organization changes.
• CUI Safeguarding Requirements: Get practical guidance on NIST 800-171, correct CUI marking, cover sheets, the DoD's mandatory training requirement, and sanitizing media so CUI is truly unrecoverable.
• CUI Enclaves: Learn how isolating CUI in a purpose-built enclave can concentrate your compliance effort and cut costs, and how to decide between building your own and buying a managed solution.

Along the way, you'll also find free tools, including the CUI Registry Quick Reference, a searchable cross-reference of every ISOO category with its markings, authorities, and DoD-specific examples, and the CUI Enclave Vendor Evaluation Checklist for contractors comparing enclave solutions.

Looking for more compliance resources?

Check out our library of compliance resources for additional policy templates, readiness checklists, and compliance hubs on other frameworks, including our CMMC Hub for the certification side of the defense compliance picture.