youtube channel PROJECT ZERO

WHAT IS : ZERO DAY COMPUTING ?

A zero-day (also known as 0-day) vulnerability is a computer-software vulnerability that is unknown to those who should be interested in mitigating the vulnerability (including the vendor of the target software). Until the vulnerability is mitigated, hackers can exploit it to adversely affect computer programs, data, additional computers or a network.^[1] An exploit directed at a zero-day is called a zero-day exploit, or zero-day attack.

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 software that had been obtained by hacking into a developer's computer before release. Eventually the term was applied to the vulnerabilities that allowed this hacking, and to the number of days that the vendor has had to fix them.^[2][3][4] Once the vendor learns of the vulnerability, the vendor will usually create patches or advise workarounds to mitigate it.

The more recently that the vendor has become aware of the vulnerability, the more likely that no fix or mitigation has been developed. Even after a fix is developed, the fewer the days since then, the higher the probability that an attack against the afflicted software will be successful, because not every user of that software will have applied the fix. For zero-day exploits, unless the vulnerability is inadvertently fixed, e.g. by an unrelated update that happens to fix the vulnerability, the probability that a user has applied a vendor-supplied patch that fixes the problem is zero, so the exploit would remain available. Zero-day attacks are a severe threat.

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