It's been called the largest IT outage in history. A simple security update took down over 8 million machines, affecting industries from airlines to broadcast news to hospitals.

The buggy update came from cybersecurity company CrowdStrike and affected systems using Microsoft.

Since that outage a couple of weeks ago, CrowdStrike and Microsoft have run their own investigations into what happened. But the federal government is also looking for answers. A House committee is calling on CrowdStrike's CEO to testify about what happened.

And the Department of Transportation is launching an investigation into Delta, which experienced ongoing delays for days after the outage.

We discuss how security update caused a global IT meltdown and how to prevent it from happening again.

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