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Z is for zero day

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zero-day exploit
A zero-day exploit is a type of computer attack that exploits a software vulnerability before that vulnerability is known to the public or the softwareʼs developer.
Zero-day exploits are very valuable to hackers and cybercriminals because they are unknown — all systems running the affected software are vulnerable, so the attack is likely to succeed.
The term “zero-day” refers to the idea that the developer has had zero days between learning of the vulnerability and the attack occurring.
Source: Zero Day Exploit

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