The end of incident recovery is declared based on criteria, and incident-related documentation is completed
Incidents need a clear end, not just a quiet fade. Without a formal close, teams remain in incident mode indefinitely, resources stay tied up, and it becomes unclear whether the organization has returned to a normal security posture. A formal close declaration, based on documented criteria and accompanied by complete incident documentation, marks the transition from response to learning: the post-incident review, lessons learned, and control improvements that prevent recurrence.
Implementation steps
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Define incident closure criteria
Document the criteria that must be met before an incident can be formally closed: all affected systems have been restored and verified clean, the initial access vector has been closed, all regulatory notification requirements have been met, documentation is complete, and the incident commander has confirmed no outstanding response actions. These criteria prevent premature closure while ensuring that incidents do not remain open indefinitely due to minor outstanding tasks.
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Complete all required incident documentation at close
When closure criteria are met, complete the incident record: a timeline of events from initial detection through recovery, the root cause finding, the full scope of impact, all containment and eradication actions taken, and the identity of all systems and data affected. This documentation is the institutional memory of the incident and the source material for post-incident review, compliance reporting, and insurance claims.
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Schedule and conduct a post-incident review
Within 5-10 business days of incident close, conduct a post-incident review (blameless where possible). The review should address: what happened and why, where detection or response could have been faster, what process or control gaps the incident exposed, and what specific action items will prevent recurrence. Assign owners and due dates to all action items and track them to completion. The review is only valuable if the action items are actually implemented.
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Evidence required
Incident closure criteria and process
Documentation of the criteria and process for formally closing incidents.
- · Incident response policy section defining incident closure criteria
- · Incident closure checklist in the incident response runbook
- · Incident management system field or workflow state representing formal close
Post-incident review records
Evidence that post-incident reviews are conducted and action items are tracked.
- · Post-incident review document from a past significant incident
- · Action item tracker showing lessons-learned follow-up items
- · Incident report submitted to leadership or a compliance body
Related controls
Execute the recovery plan once the incident response process initiates recovery
Incident Recovery Plan Execution
The integrity of restored assets is verified, the asset is deemed secure, and normal operating status is confirmed
Incident Recovery Plan Execution
Select, scope, prioritize, and perform recovery actions
Incident Recovery Plan Execution
Verify the integrity of backups and restoration assets before use
Incident Recovery Plan Execution