What is a zero-day vulnerability?
A zero-day vulnerability is a type of unknown or unexpected software or security vulnerability in an IT system that can be exploited by hackers. On any given day, IT pros can refer to a number of zero-day vulnerabilities.
The term is based on the common use of the term 'zero day' to describe the first day on which a specific IT problem is identified. Zero Day also serves as a benchmark for these types of software problems. In the tech world, a zero-day vulnerability describes the urgency of this type of IT problem.
Typically, IT and security professionals should look for upgrades or patches that can fix zero-day vulnerabilities, or change systems to improve data and asset security. In short, if a vendor fails to provide security for an issue that has been discovered and zero-day vulnerable, it gets brought into the consciousness of developers and security communities and enables future organizations to respond quickly to appropriate network security.