DoS (Denial of Service) org.apache.struts:struts2-core Dependency in Crowd Data Center and Server

This High severity org.apache.struts:struts2-core Dependency vulnerability was introduced in versions 5.0.0, 5.1.0, and 5.2.0 of Crowd Data Center and Server.

This org.apache.struts:struts2-core Dependency vulnerability, with a CVSS Score of 7.5 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H allows an unauthenticated attacker to expose assets in your environment susceptible to exploitation which has no impact to confidentiality, no impact to integrity, high impact to availability, and requires no user interaction.

Atlassian recommends that Crowd Data Center and Server customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:

||Affected versions||Fixed versions||
|5.2.0 to 5.2.4|5.3.0|
|5.1.0 to 5.1.9|5.3.0|
|5.0 to 5.0.11|5.3.0|
|Any earlier versions|5.3.0|

See the release notes ([https://confluence.atlassian.com/crowd/crowd-release-notes-199094.html]). You can download the latest version of Crowd Data Center and Server from the download center ([https://www.atlassian.com/software/crowd/download-archive]).

The National Vulnerability Database provides the following description for this vulnerability: When a Multipart request is performed but some of the fields exceed the maxStringLength  limit, the upload files will remain in struts.multipart.saveDir  even if the request has been denied.
Users are recommended to upgrade to versions Struts 2.5.32 or 6.1.2.2 or Struts 6.3.0.1 or greater, which fixed this issue.