Spring4Shell: What we know about the Java RCE vulnerability

Spring4Shell is a reported remote code execution vulnerability in the Spring Framework’s spring-beans package that emerged amid confusion, deleted social media posts, and initially incomplete public information in late March. The exploit can reportedly manipulate a Java ClassLoader through a specially crafted HTTP POST request and was known at the time to affect environments using JRE 9 or later together with Tomcat 9 or later. Security researchers concluded that the threat was credible and recommended upgrading Spring Framework to versions 5.2.20 or 5.3.18, or upgrading Spring Boot to versions 2.5.12 or 2.6.6, while using JRE 8 or an earlier Tomcat version could serve as a temporary mitigation when upgrades were not possible. The account also distinguishes Spring4Shell from a separate Spring Cloud Function vulnerability that was frequently conflated with it, notes that additional vulnerabilities or patches could emerge as investigation continued, and points users to Snyk tooling for vulnerability detection.

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