Zero-day
As has been mentioned, many software-developing companies have rigorous patch management, and therefore they always update their software whenever a vulnerability is discovered. This frustrates hacking efforts targeted at exploiting vulnerabilities that software developers have already patched. As an adaptation to this, hackers have discovered zero-day attacks. Zero-day attacks use advanced vulnerability discovery tools and techniques to identify vulnerabilities that are not yet known by software developers.
Zero-day vulnerabilities are discovered or known system security flaws that have no existing patches. These flaws can be exploited by cybercriminals to the great detriment of their targets. This is because targets with systems containing these flaws are often caught by surprise and will have no defense mechanisms effective against the vulnerabilities, since the software vendors will not have provided any. The following are some of the latest known zero-day vulnerabilities...
