What is a zero-day attack and how can you defend against one?
Zero-day vulnerability: A security flaw in software, hardware, or firmware that is unknown to the vendor responsible for fixing it. Because no patch exists, the flaw is exploitable from the moment it is discovered by an attacker. Zero-day exploit: The specific technique, code, or method an attacker uses to take advantage of a zero-day vulnerability. A single vulnerability may have multiple exploits.