Cybersecurity Lingo: What is a “zero day” ?

Cybersecurity Lingo: What is a “zero day” ?

A zero day is the worst kind of security bug: a hole that is already in use by attackers or was published before a software vendor could fix it. The vendor has had “zero days” to fix it.

An example: on Good Friday several years ago hackers released several security holes for Windows. These bugs were previously unknown outside the NSA and Microsoft didn’t have a fix for them yet.

Zero days are never good. Your cybersecurity provider needs to find a way to block or mitigate the zero day on their own because, by definition, there is no official fix for it yet.

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