Zero-day attacks

1. A cyber exploit that relies on exploiting an unknown or undisclosed vulnerability in the design or implementation of a system to violate its security.

Source: U.S. Cyberspace Solarium Commission, March 2020,

2. A threat that takes advantage of a previously unknown system or network vulnerability that developers haven’t yet had time to patch.

Source: Guide to Cybersecurity as Risk Management: The Role of Elected Officials, Governing Institute, CGI,