This High severity DoS (Denial of Service) vulnerability was introduced in versions 6.2.0, 6.3.0, 7.0.0, 7.1.0, and
7.2.0 of Crowd Data Center.

This DoS (Denial of Service) vulnerability, with a CVSS Score of 8.7 and a CVSS Vector of
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N 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 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 7.2: Upgrade to a release greater than or equal to 7.2.2

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

The National Vulnerability Database provides the following description for this vulnerability:

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final,
the `Bzip2Decoder` handler in Netty's compression codec pipeline is vulnerable to a denial-of-service attack through a
malformed bzip2 stream that permanently captures the event-loop thread in an infinite loop. The vulnerability exists in
the run-length encoding (RLE) state machine within [`Bzip2BlockDecompressor.read()`]. This issue has been fixed in
versions 4.1.136.Final and 4.2.16.Final.