This DoS (Denial of Service) vulnerability was introduced in versions 10.1.1, 10.2.0, 10.3.0, 10.4.1, 10.5.0, 10.6.0,
10.7.1, 11.0.0, and 11.1.0 of Jira Software 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 consume system
resources, which has no impact to confidentiality, no impact to integrity, high impact to availability, and requires no
user interaction.

Atlassian recommends that Jira Software 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:

• Jira Software Data Center 10.3: Upgrade to a release greater than or equal to 10.3.24

See the release notes (https://www.atlassian.com/software/jira/download-archives). You can download the latest version
of Jira Software Data Center from the download center (https://www.atlassian.com/software/jira/download-archives).

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

Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, Immutable.Map and
Immutable.Set keep keys that share the same 32-bit hash in a HashCollisionNode collision bucket that is scanned
linearly, allowing an attacker who controls keys inserted into a Map, such as through Immutable.Map(obj),
Immutable.fromJS(obj), state.merge(userObject), or mergeDeep, to craft many colliding keys and degrade insertion and
lookup to consume disproportionate CPU. This issue is fixed in versions 4.3.9 and 5.1.8.