Synopsis The Analyst Prompt Issue #18 briefly explores the hype around zero-day vulnerabilities and the benefit of focusing on tactics and techniques featured in common threats and attack patterns rather than highlighting cutting-edge cyberattacks to improve metrics and cyber defense. As an example of the value of strong fundamentals, we look at the initial reports about the Uber breach versus an analysis of current trends in zero-day use in cyberattacks. Key Infrastructure and Critical Vulnerabilities: Zero-Day Software Vulnerabilities Remain High Profile, but are Not a Factor in the Majority of Successful Cyberattacks Zero-day exploits have come under increased scrutiny after malware vendors including FinFisher, the NSO Group, Hacking Team, and others demonstrated a growing market for custom, paid-for exploits. Our increasingly connected world ensures constantly growing impacts from zero days. At the end of August, VX Underground reported a new iOS remote code execution vulnerability