Log4Shell is a critical zero-day vulnerability in the Apache Log4j 2 library, disclosed on December 9, 2021, that allows remote code execution by manipulating log data. Attackers can exploit it by crafting requests that make the affected system download and execute malicious commands. Organizations must urgently address this vulnerability, especially in Java processes exposed to public internet, as they pose the highest risk of unauthorized access to sensitive data. Prioritization should focus on publicly accessible Java processes, those handling critical databases or file systems, and applications using the library. Tools like Dynatrace Application Security have proven effective in identifying and mitigating risks by detecting exposed Java processes and assessing the environmental risks through tools like the Davis Security Score. A swift response is crucial to secure systems and safeguard data from potential exploitation.