System / Technologies Affected
    l JDK 9 or higher
    l Apache Tomcat as the Servlet container
    l Packaged as a traditional WAR (in contrast to a Spring Boot executable jar)
    l spring-webmvc or spring-webflux dependency
    l Spring Framework versions 5.3.0 to 5.3.17, 5.2.0 to 5.2.19, and older versions

    参考文档：
    https://zhuanlan.zhihu.com/p/491123557