ISO 27001 Incident Response Requirements and Exercise Guide

ISO 27001 is the international standard for information security management systems (ISMS). One of its most critical components is building effective incident response capabilities and testing them regularly through exercises.

Incident Response Requirements in ISO 27001

ISO 27001:2022 dedicates a specific section within its Annex A controls to incident management:

A.5.24 — Planning and Preparation

Organizations must define responsibilities and procedures for managing information security incidents, including documented response plans, clear roles, classification criteria, and communication procedures.

A.5.25 — Assessment and Decision Making

Criteria must be established for assessing incident severity and making appropriate response decisions.

A.5.26 — Response to Incidents

Incidents must be responded to according to established procedures, with all response activities recorded.

A.5.27 — Learning from Incidents

Knowledge gained from incidents must be used to reduce the likelihood or impact of future events.

Exercise Requirements

ISO 27001 requires regular testing of incident response plans. Auditors specifically look for:

• Planned exercise schedule and completion records
• Exercise result reports and findings
• Improvement actions based on findings
• Evidence that improvements have been implemented
• Evidence of the PDCA cycle functioning

Common Non-Conformities

• Incident response plan never tested
• Insufficient or incomplete exercise records
• No corrective actions taken based on findings
• Communication procedures not tested
• Senior management not involved in exercises

Recommended Annual Exercise Program

• Q1: Tabletop exercise — Data breach scenario
• Q2: Functional exercise — Ransomware response
• Q3: Communication exercise — Crisis communication plan test
• Q4: Full-scale simulation — Comprehensive crisis scenario