InspeticaOpen the daily feed

Cyber Safety · 45 sec

Zero-day vulnerability

A concept that can help you make safer digital choices.

  1. The useful idea

    A zero-day (also known as a 0-day) is a vulnerability or security hole in a computer system unknown to its developers or anyone capable of mitigating it.

  2. How it works

    Until the vulnerability is remedied, threat actors can exploit it in a zero-day exploit, or zero-day attack.

  3. Why it matters

    The term "zero-day" originally referred to the number of days since a new piece of software was released to the public, so "zero-day software" was obtained by hacking into a developer's computer before

Use Zero-day vulnerability to recognize risk and choose the safer digital action.

Use Zero-day vulnerability to recognize risk and choose the safer digital action.

Test your recall

Which idea belongs to the explanation of Zero-day vulnerability?

  • How it works
  • The useful idea — correct
  • Why it matters

A zero-day (also known as a 0-day) is a vulnerability or security hole in a computer system unknown to its developers or anyone capable of mitigating it.

EvergreenLast verified 2026-07-19

Sources