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Definition: zero-day exploit


A malware attack that takes place immediately after a vulnerability is discovered and before a patch is deployed to the OS, Web browser or application. When a vulnerability is discovered by a user, it often winds up on one or two blogs, and the news travels fast. If only the software vendor becomes aware of it, the tendency is to keep the problem under wraps until a patch has been created to fix it. However, in many cases, vendors announce the flaw so that users can steer clear of the infected website, application or email attachment. See exploit.