An access permission override in Apache Struts 2.0.0 to 2.5.20 may cause a Denial of Service when performing a file upload.
https://cwiki.apache.org/confluence/display/ww/s2-060
https://launchpad.support.sap.com/#/notes/2982840
https://www.oracle.com/security-alerts/cpuApr2021.html