An exploit for a critical zero-day vulnerability affecting Apache Log4j2 known as Log4Shell was disclosed on December 9, 2021. All versions of Log4j2 versions >= 2.0-beta9 and <= 2.15.0 are affected by this vulnerability. This vulnerability is actively being exploited in the wild. The vulnerability, when exploited, results in remote code execution on the vulnerable server with system-level privileges. As a result, it is rated at CVSS v3 score of 10.0.