- Meaning
- Reaction to security incidents
- Phases
- Detect, analyse, contain, eradicate, recover
- Tool
- Incident response plan (IRP)
- Relation to NIS2
- Required measure
- Updated
- June 2026
- Editorial team
- Compliance Compass
What is incident response?
Incident response is the organisational ability to react in a planned and active way to a security incident . Instead of improvising in the chaos, an organisation follows fixed procedures with clear responsibilities, so as to limit damage, secure evidence and become able to act again quickly. Whereas Incident handling stresses the continuous processing chain, incident response is about the fast, coordinated reaction and the strategic readiness behind it – it is a core capability of every modern security organisation.
The phases of incident response
- Detect: identify the incident – often from Indicators of Compromise.
- Analyse & contain: determine the extent and stop it spreading.
- Eradicate: remove the cause and close the Vulnerabilities that let it in.
- Recover: bring operations safely back to normal and draw the lessons.
Preparation is everything
The key to a fast reaction lies in preparation: a rehearsed Incident response plan with clear roles, escalation and decision paths and stored contact details. Larger organisations set up their own CSIRT for this, which coordinates incidents. Playing the procedures through regularly in exercises wins the decisive minutes when it matters – because under pressure only what has been trained beforehand is recalled reliably.
Incident response and NIS2
NIS2 requires working processes for dealing with incidents – not least because the reporting deadlines of 24 hours (early warning), 72 hours (incident notification) and one month (final report) can only be met with well-practised incident response. Example: if a SOC reports unusual data exfiltration at 10 p.m., the on-call rota immediately alerts the designated incident lead; the in-house CSIRT isolates the affected accounts, documents the findings and prepares the 24-hour early warning to the national CSIRT or competent authority in parallel – without first having to work out who is responsible.
Further reading: Directive (EU) 2022/2555 (NIS2), Articles 21 and 23 (EUR-Lex)
Frequently asked questions
What is incident response?
Incident response is the organisational ability to react to a security incident in a planned and active way – from detection through analysis and containment to eradicating the cause and restoring normal operations. Instead of improvising, an organisation follows fixed procedures with clear responsibilities, so as to limit damage, secure evidence and become able to act again quickly.
What makes incident response good?
Good incident response rests on a rehearsed incident response plan, clearly assigned roles with named deputies, documented escalation and decision paths, and procedures trained regularly in exercises. Larger organisations also set up a CSIRT that coordinates incidents. Under pressure only what has been trained beforehand is recalled reliably, which is why preparation decides the outcome.
How does incident response relate to NIS2?
NIS2 requires essential and important entities to have working processes for dealing with incidents. Without well-practised incident response the reporting chain of 24 hours (early warning), 72 hours (incident notification) and one month (final report) can hardly be met. Article 34 sets minimum ceilings for fines of at least EUR 10 million or 2 % of total worldwide annual turnover for essential entities, and Member States may set higher amounts.