This High severity org.apache.tomcat:tomcat-coyote Dependency vulnerability was introduced in versions 5.2.0, 5.3.0, and 6.0.0 of Crowd Data Center and Server.

This org.apache.tomcat:tomcat-coyote Dependency vulnerability, with a CVSS Score of 8.6 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:

• Crowd Data Center and Server 5.3: Upgrade to a release greater than or equal to 5.3.5

• Crowd Data Center and Server 6.0: Upgrade to a release greater than or equal to 6.0.3

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: Allocation of Resources Without Limits or Throttling vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.0-M20, from 10.1.0-M1 through 10.1.24, from 9.0.13 through 9.0.89. Older, unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.0-M21, 10.1.25, or 9.0.90, which fixes the issue.

Apache Tomcat, under certain configurations on any platform, allows an attacker to cause an OutOfMemoryError by abusing the TLS handshake process.