Yasuo is a Ruby-based network scanning tool designed to identify vulnerable third-party web applications and web front-ends during security assessments. The tool focuses on discovering commonly exploited applications such as Apache Tomcat administrative interfaces, JBoss jmx-console, Hudson Jenkins, and other web-based management systems that may contain publicly known vulnerabilities. Yasuo scans networks to locate web applications that could be susceptible to various attack vectors including remote code execution (RCE), malicious file uploads, SQL injection, and remote/local file inclusion vulnerabilities. The scanner is built to quickly identify potentially compromised targets by checking for applications with known security flaws that are documented in exploit databases. Yasuo serves as a reconnaissance tool for penetration testers and security professionals conducting internal assessments, external assessments, and red team engagements to identify vulnerable web applications that could provide entry points into target systems.