Zero-day vulnerability

Last updated on December 23rd, 2020 by Radostin Angelov. Filed under

A zero-day vulnerability is a previously undisclosed vulnerability, of which details are not known by the public. It is called 0-day because once someone knows about the security flaw, the software vendor has zero days available to advise countermeasure procedures, including releasing a security patch. When the details of a zero-day vulnerability are published before the vendor is advised about the security issue, the chances of malicious hackers mass exploiting such vulnerability are very high because owners of the vulnerable software have no way to protect their setup from such attacks.

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