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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I want to start learning fuzzing windows applications, where should I start?

I got my B.Sc. in computer science and I am familiar with basic assembly language. I want to start learning about how to find vulnerabilities in Windows applications, e.g. buffer overflows, ...
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Can I use process crash information to detect buffer overflow attacks?

Buffer overflow is a very common vulnerability, often targeted with zero-day exploits. Successful attacks often result in arbitrary code execution, while failed attempts tend to crash the target ...