From Day Zero to Zero Day. A Hands-On Guide to Vulnerability Research by Eugene Lim, 2025 (Early Access edition)

In this hands-on guide, award-winning white-hat hacker Eugene “Spaceraccoon” Lim breaks down the real-world process of vulnerability discovery. You’ll retrace the steps behind past CVEs, analyze open source and embedded targets, and build a repeatable workflow for uncovering critical flaws in code.

Whether you’re new to vulnerability research or sharpening an existing skill set, this book will show you how to think—and work—like a bug hunter.

Eugene Lim (aka “Spaceraccoon”) is a security researcher and white-hat hacker who has reported hundreds of vulnerabilities across enterprise software, hardware, and cloud services. In 2021, he was one of five researchers selected from a pool of over one million for HackerOne’s H1-Elite Hall of Fame. His research has been featured at Black Hat and DEF CON and in WIRED and The Register.

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