What is a zero-day (0-day) attack?
When the term is used in relation to popular protocols, it means a DDoS attack that exploits vulnerabilities previously unknown to security experts. If used when talking about popular software products, the term refers to security bugs of which their developers were previously unaware. Often, a DDoS attack can be referred to as zero-day if it is implemented using brand new methods that were never used before.
You might also want to learn about Different Types of DDoS Attacks.
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