A zero-day (or zero-hour or day zero) attack or threat is an attack that exploits a previously unknown vulnerability in a computer application, meaning that the attack occurs on "day zero" of awareness of the vulnerability.

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find if 0-day flash bug was exploited (on a particular machine)

There have been several critical 0-day exploits in the past days/weeks in Flash alone. Nobody knows how long the 0-days have been exploited, and it is reasonable to expect that there are 0-days being ...
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How can I get confirmation of new security problem in struts2?

I just read about this new struts2 security problem. I want to tell our developers to patch it, but I wish for some more sources first. The only source he cites is in another language. I guess I ...