Incident Response Reporting and Communication (RS.CO) — NIST CSF 2.0 Category

Category outcome

NIST CSF 2.0 places Incident Response Reporting and Communication (RS.CO) within the Respond Function. The official Category outcome is: “Response activities are coordinated with internal and external stakeholders as required by laws, regulations, or policies.”

This Category provides a structured way to address stakeholder notification, coordination, information sharing, and obligation-aware communication. It groups related Subcategory outcomes without prescribing a specific technology, organizational model, or implementation sequence.

What this means in practice

A credible Incident Response Reporting and Communication capability connects policy and risk decisions to repeatable operating practices. The organization should define scope, ownership, expected outcomes, evidence, exceptions, and reassessment triggers.

Implementation should be proportionate to mission needs, legal and contractual obligations, threat exposure, business impact, and the organization’s risk appetite. The same Category may be implemented differently across systems and business contexts.

Implementation priorities

The following priorities translate the Category into an operating capability. They are starting points for design and governance, not a replacement for architecture, procedures, or risk analysis.

• Maintain stakeholder, regulator, customer, supplier, insurer, and authority contact paths.
• Define notification triggers, approval authority, timing, and content requirements.
• Coordinate messages across technical, legal, privacy, communications, and leadership teams.
• Share actionable information through protected and appropriate channels.
• Record what was communicated, by whom, when, to whom, and under which obligation.

Evidence and measurement

Evidence should show that the Category’s outcomes are achieved in the intended scope, remain effective, and are reviewed when conditions change. A policy, tool purchase, or completed checklist is not sufficient by itself.

• Communication plans and contact rosters
• Notification decision records and approvals
• Stakeholder, regulator, customer, and supplier messages
• Information-sharing records and channel protections
• Communication timelines and obligation mapping

Subcategories within RS.CO

This Category contains 2 CSF 2.0 Subcategory outcomes. Each outcome has a dedicated Bare Metal Cyber profile with the official NIST statement and original implementation guidance.

• RS.CO-02 — Notify Stakeholders: Internal and external stakeholders are notified of incidents
• RS.CO-03 — Share Incident Information: Information is shared with designated internal and external stakeholders

Using this Category in Current and Target Profiles

For a Current Profile, record which Subcategory outcomes are achieved, the scope of the assessment, and the evidence supporting the judgment. For a Target Profile, select the outcomes needed to meet risk management objectives and describe the target conditions.

Prioritize the resulting gaps by mission consequence, risk exposure, dependencies, obligations, implementation effort, and the value of the improvement. Record the owner and the evidence that will demonstrate closure.

Common failure modes

The following conditions can create the appearance of coverage without reliable outcome achievement. Treat them as hypotheses to test during assessments, exercises, and operational reviews.

• Contact information or notification obligations are outdated.
• Technical and public messages contradict each other.
• Information is shared too broadly or through insecure channels.
• Approvals delay required notification beyond legal or operational thresholds.

Source, scope, and attribution

The Category identifier, name, description, and Subcategory outcomes are from NIST CSWP 29. Bare Metal Cyber’s implementation, evidence, failure-mode, and Profile guidance is original educational material.

The CSF describes outcomes, not mandatory implementation steps. Use NIST’s current online Implementation Examples and Informative References when selecting practices and controls for a specific environment.

Certification relevance

This subject appears in or supports the following certification bodies of knowledge:

Authoritative sources

• NIST Cybersecurity Framework (CSF) 2.0 — NIST CSWP 29
• NIST Cybersecurity Framework Resource Center
• NIST CSF 2.0 Reference Tool
• NIST CSF 2.0 Organizational Profiles