Zero days explained: How unknown vulnerabilities become gateways for attackers

A zero day is a security flaw that has not yet been patched by the vendor and can be exploited. The name evokes a scenario where an attacker has gotten the jump on a software vendor, implementing attacks that exploit the flaw before the good guys of infosec are able to respond.

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Ivanti — Zero Day Vulnerabilities, BSI Translation and Technical Deep Analysis, by Simone Kraus, Jan, 2024