Experienced a breach? Here’s what to do right now.

A breach doesn’t wait. Neither should you. Find out exactly what to do in the first 24 hours, what a breach response timeline looks like, and how Illumio can help.

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What to do immediately after a security breach

If you suspect an active breach, take these steps right away. The speed of containing a breach directly affects the size of the damage.

Isolate affected systems

Segment or disconnect compromised systems right away. Microsegmentation lets you do this without taking your whole network offline. Don't shut systems down entirely. It destroys key evidence.

Map the damage

Find out into which systems and data were accessed, where the attacker went, and what they touched. The faster you know the scope, the faster you can stop the damage.

Save logs and evidence

Save logs, system snapshots, and network data before they're lost. You'll need this for your investigation, compliance reporting, and any legal action that follows.

Alert your team

Don't wait on this step. Contact your security team, legal counsel, and leadership immediately. Many companies must notify regulators or affected users within set time limits.

A typical breach response timeline

Incident response follows a clear pattern. Knowing what to focus on at each stage helps your team move fast under pressure.

How Illumio can help

Illumio gives you the visibility and control to stop lateral movement, find the blast radius, and contain the breach fast across your entire hybrid multi-cloud environment.

See everything, instantly

You can't secure what you can't see. Illumio maps every connection across your cloud, data center, and endpoint environments in real time. You'll know exactly where the attacker is and where they're headed.

Stop the spread

Illumio microsegmentation lets you isolate compromised systems with a single click. No taking the whole network offline. Just a clean, fast cut to block the attacker's path before they reach your critical assets.

Find the attack blast radius

Know the full scope fast. Illumio maps every workload, connection, and dependency in your environment so your team knows exactly what was touched, what wasn't, and where to focus next.

Get back to business faster

Breach containment is just the start. Illumio helps your team close the gaps the attacker used, harden your environment, and make sure the next breach stops where it starts. That’s Zero Trust in practice.

Breaches are more common and costly than ever

22,000+

The number of confirmed breaches Verizon analyzed across 145 countries in its 2026 DBIR.

$4.44M

The global average cost of a data breach in 2025.

13 %

Most organizations that get hit by ransomware never fully recover their data.

Illumio Simplifying Segmentation book cover

Simplifier la segmentation

Cyber threats move fast, spread quietly, and exploit trusted connections. Prevention alone can’t stop them. To stay resilient, organizations must focus on containing attacks before they escalate. This ebook delivers a clear, phased roadmap to deploy segmentation with minimal risk and measurable value.

Need help containing an active breach?

Découvrez comment l'isolation des incidents alimentée par l'IA aide votre équipe à accomplir plus avec moins de ressources.

Breach Containment FAQs

A breach is stressful. Knowing what to expect and what to do makes all the difference. Here are answers to the questions we hear most from organizations navigating an active incident or recovering from one.

How do I know if my organization has been breached?
How do I talk to my customers about a breach?
How long does it take to recover from a data breach?
What is lateral movement and why does it matter?
How do I investigate a breach?
Do I need to notify regulators after a data breach?
What is Zero Trust and how does it help after a breach?
How long do attackers stay in your network undetected?