Software testing is notoriously challenging, with subtle issues such as CRLF vulnerabilities often overlooked, and the complexity of systems like Log4j elevates these challenges. The Log4Shell vulnerability, present since 2013 and unnoticed until its discovery as a zero-day exploit, highlights the difficulties of detecting unknown security vulnerabilities. Traditional methods like fuzzing and manual code review face limitations due to the vagueness of requirements and the inherent complexity of software. While static analysis offers a promising approach by examining potential data paths without code execution, its tendency for false positives poses a significant drawback. The article suggests a shift towards more interactive static analyzers that provide real-time, visual guidance on potential risks from user inputs during coding. This approach could be a game-changer in zero-day vulnerability detection by allowing developers to better identify and address vulnerabilities early in the development process, integrating seamlessly into DevSecOps practices.