The Spring4Shell vulnerability is a critical flaw in the Spring Java framework that allows attackers to bypass protections and execute remote code on vulnerable systems. It was initially confused with another vulnerability but has been identified as a separate issue, now tracked as CVE-2022-22965. The vulnerability affects Spring Core and can be exploited by sending specially crafted HTTP requests, which can lead to unauthenticated remote code execution. Several proofs of concept have been published, and the vulnerability is already being actively exploited in the wild. To remediate the issue, users need to ensure their deployments of the Spring framework are running a version equal to or greater than 5.3.18 or 5.2.20. Additionally, Datadog's Security Platform can provide automatic detection of Spring4Shell exploit attempts and post-exploitation activity within systems.