Logo: to the web site of the Swedish Defence University

This article addresses the question under which circumstances zero-day vulnerabilities should be disclosed or used for offensive cyberspace operations. Vulnerabilities exist in hardware and software and can be seen as a consequence of programming errors or design flaws. The most highly sought are so-called zero-day-vulnerabilities. These vulnerabilities exist but are unknown and, when exploited, enable one way of entry into a system that is otherwise not thought possible. Therefore, from an anticipatory ethics perspective, it is important to understand in what cases zero-days should be disclosed or not.