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3.6.1OFFICIAL STATEMENT BELOWBASIC REQUIREMENTPENDING NIST SME REVIEW

3.6.1 — Incident-handling capability

3.6 Incident Response · NIST SP 800-171 Rev. 2 · The heading label is this site's navigational shorthand; the official language is the statement below.

Official requirement statement (verbatim)

Establish an operational incident-handling capability for organizational systems that includes preparation, detection, analysis, containment, recovery, and user response activities.

NIST SP 800-171 Rev. 2 — Protecting CUI in Nonfederal Systems ↗NIST SP 800-171A — Assessing Security Requirements for CUI ↗
Independent interpretation

What this requirement is after

An incident response capability that operates, not a binder that exists. All six named activities — preparation, detection, analysis, containment, recovery, user response — have to be real: people know who declares an incident, who may disconnect what, how recovery actually happens, and what a user does when something looks wrong.

Across revisions

Carried into Rev. 3 as 03.06.01 (Incident Handling). Rev. 3 also adds incident response training (03.06.04) and a written incident response plan (03.06.05) as new standalone requirements — expectations Rev. 2 left implicit inside this one.

Mapped practices

Brilliant at the Basics practices that support this requirement

Partial implementation supportModerate confidence

Why: The practice builds and exercises the response-and-recovery capability for the operational side of the house — named roles, containment options pre-agreed with process owners so a response action does not trip a process or create a safety hazard, and identified recovery sources for controller logic and configuration. That is the requirement's preparation-through-recovery arc, applied to the plant.

What this does not claim: The practice is deliberately OT-scoped, while this requirement covers the organization's entire in-scope environment — the enterprise incident-handling capability has to exist independently of anything this practice does. It applies at all only where OT systems fall within the CUI boundary, which is the exception rather than the rule.

Practice-side activities
  • Write the OT response plan with safe containment options agreed with the process owner in advance
  • Identify and test recovery sources — controller logic and configuration backups — for critical lines
  • Establish joint IT/OT response roles so the two sides act on one plan under pressure
Evidence this produces
  • The OT incident response plan with named roles and reachable contacts
  • Restore-test records for controller configurations
  • After-action records from exercises and real events

Where this holds: Holds only where OT equipment or its data sits inside the CUI boundary; the organization-wide capability the requirement demands is separate work.

Review status: Technical review complete · Reviewed by inDirectIT practitioner review — CUI security and NIST SP 800-171 engineering · updated 2026-08-06

Partial implementation supportModerate confidence

Why: Recovery is one of the six activities this requirement names, and tested restore capability — immutable copies, timed test restores, separated backup administration — is what makes that phase real rather than aspirational when an incident reaches it.

What this does not claim: May partially address the recovery phase only. Preparation, detection, analysis, containment, and user response — the other five activities the requirement names — are untouched by backup architecture and need their own capability, plan, and people. A tested restore inside an incident that nobody could detect or contain is not an incident-handling capability.

Practice-side activities
  • Test restores on a schedule and time them against what the business expects, so recovery inside an incident is a rehearsed act
  • Keep at least one copy production credentials cannot alter, so recovery survives the incident that triggered it
  • Reference the tested recovery procedures from the incident response plan rather than leaving them in a separate silo
Evidence this produces
  • Timed test-restore records referenced from the response plan
  • Immutability verification for critical datasets

Review status: Pending NIST SME review · Reviewed by Brilliant at the Basics editorial — practitioner-authored; NIST SME review pending · updated 2026-08-06

Doing the work

Implementation considerations and evidence

Implementation considerationsIndependent guidance — tailor to your environment
  • Settle decision rights before an incident: who can isolate a system, who calls counsel and the contracting officer, who speaks for the organization. The plan is mostly a record of decisions made calmly.
  • Write playbooks for the incidents the environment realistically faces — ransomware, business email compromise, a lost device — rather than adapting a generic template's table of contents.
  • Where production equipment is in scope, containment can trip a process or create a safety hazard; pre-agree safe containment options with the process owner instead of improvising them at 2am.
  • Recovery belongs inside the capability: tested restores and named recovery sources, not a separate document nobody links to the plan.
What operating evidence looks likeRecords worth retaining, not a submission checklist
  • The incident response plan with named roles and contacts verified reachable
  • Records of real incidents handled through the documented process
  • Preparation artifacts: escalation lists, playbooks, retainer or support agreements

Suggested owners, derived from the mapped practices and artifacts: Plant / OT leader · IT leader · IT leader or incident response lead. Ownership is a named person in your organization, not a role on a website.

Artifacts

Templates and worksheets with a mapped relationship

PLAN · REVIEW ANNUALIncident Response Plan Template
The other revision

Where this lands in Rev. 3

Provenance

Sources and review status

Primary sourcesNIST SP 800-171 Rev. 2 — Protecting CUI in Nonfederal Systems · NIST SP 800-171A — Assessing Security Requirements for CUI
Review statusPending NIST SME review
Content version1.0
Updated