What is the NIST Cybersecurity Framework (CSF)?

Definition

The NIST Cybersecurity Framework (CSF) is a voluntary framework published by the US National Institute of Standards and Technology. It gives organizations a common language and structure for assessing and improving their management of cybersecurity risk.

Background

CSF is deliberately technology- and sector-neutral. The current edition, CSF 2.0 (2024), is built around its functions: Govern (added in 2.0), Identify, Protect, Detect, Respond, and Recover. Each function breaks into categories and subcategories of outcomes. Organizations use Tiers to describe how mature their risk management is, and Profiles to describe their current and target states. Because it is voluntary and outcome-based, CSF pairs well with prescriptive standards like ISO 27001 or control catalogs like NIST SP 800-53. NIST released the first version in 2014 for critical infrastructure and updated it to version 1.1 in 2018. CSF 2.0, published in February 2024, widened the intended audience to organizations of any size or sector. Govern covers organizational context, risk management strategy (including risk appetite and risk tolerance), roles and responsibilities, policy, oversight, and cybersecurity supply chain risk management. Detect is organized around continuous monitoring and adverse event analysis. NIST also publishes supporting material, including Quick Start Guides, implementation examples and informative references that map CSF outcomes to other standards.

Why it matters

CSF is a widely understood way to describe a security program to executives, boards, and customers without drowning them in control IDs. It is especially useful as an organizing backbone that other frameworks map into. The CSF describes outcomes and leaves the choice of security controls to you, so you pick controls from a catalog or your own library and show which outcomes each one supports. The Tiers (Partial, Risk Informed, Repeatable and Adaptive) describe how rigorous your cybersecurity risk governance and management are. Choosing a target Tier is a business decision tied to your risk and resources, and the highest Tier is not the right goal for every organization.

Step by step

1. Scope the part of the business the profile will cover.
2. Create a Current Profile: which CSF outcomes you achieve today.
3. Run a risk assessment for the same scope, so the Target Profile reflects real threats and your stated risk tolerance.
4. Set a Target Profile based on your risk appetite and obligations.
5. Identify and prioritize the gaps between current and target.
6. Map the security controls you already run to CSF subcategories, so the gap list only shows outcomes that nothing covers yet.
7. Build an action plan and track progress against each function.
8. Reassess periodically as the business and threat landscape change.
9. Feed results from continuous monitoring and incident reviews back into the profile, so the program improves between formal reassessments.

Examples

• An SMB uses CSF to give its board a one-page view of security posture across the functions.
• A company maps its existing SOC 2 and ISO 27001 controls into CSF functions to report progress in plain language.
• A software company works through the supply chain outcomes under Govern (GV.SC): it ranks its cloud and payment providers by criticality and writes security requirements into their contracts.

Common mistakes

• Treating CSF as a checklist to “complete” rather than a way to describe and improve outcomes.
• Ignoring the new Govern function, which anchors the rest of the program.
• Building a Target Profile disconnected from actual business risk.
• Mapping controls to subcategories once and never updating the map when systems or suppliers change.

FAQ