The term "day zero attack" (also known as a "zero-day attack") refers to exploits of computer security vulnerabilities that either (1) have not yet been patched or (2) have not been discovered by those in charge of creating a patch. Simply put, they are vulnerabilities with no ready solution. The number of zero-day attacks is rising steadily from year to year, making it harder and harder to protect victim networks. It is believed that in the near future day zero attacks will account for more than 50% of all reported attacks! And this brings me to the topic of "layered security".
With so many unknown and unpredictable exploits looming on the horizon, having strategically aligned layers of security has never been so essential. You must have organizational rules that are followed to the "t". Software tools are needed that not only patch and stop known attacks, but also recognize and analyze patterns of activity to flag a possible day zero attack before it brings down an entire network. Physical protection is very important as well to protect from theft and natural disasters which can be more devastating than day zero attacks.
On the level of personal computing, you can make sure to update our software regularly. You can encrypt your wireless home network. Also install antivirus software, and just be smart.
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