DoS (Denial of Service) ch.qos.logback:logback-classic Dependency in Confluence Data Center and Server

This High severity ch.qos.logback:logback-classic Dependency vulnerability was introduced in versions 6.0.1 of Confluence Data Center and Server.

This ch.qos.logback:logback-classic 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.
h2. Data Center

Atlassian recommends that Confluence Data Center customers upgrade to the latest version. If you are unable to do so, upgrade your instance to one of the specified supported fixed versions:

||Affected versions||Fixed versions||
|from 8.7.0 to 8.7.1|8.8.0 recommended or 8.7.2|
|from 8.6.0 to 8.6.2|8.8.0 recommended|
|from 8.5.0 to 8.5.4 LTS|8.8.0 recommended or 8.5.5 LTS or 8.5.6 LTS|
|from 8.4.0 to 8.4.5|8.8.0 recommended or 8.5.6 LTS|
|from 8.3.0 to 8.3.4|8.8.0 recommended or 8.5.6 LTS|
|from 8.2.0 to 8.2.3|8.8.0 recommended or 8.5.6 LTS|
|from 8.1.0 to 8.1.4|8.8.0 recommended or 8.5.6 LTS|
|from 8.0.0 to 8.0.4|8.8.0 recommended or 8.5.6 LTS|
|from 7.20.0 to 7.20.3|8.8.0 recommended or 8.5.6 LTS|
|from 7.19.0 to 7.19.17 LTS|8.8.0 recommended or 8.5.6 LTS or 7.19.18 LTS or 7.19.19 LTS|
|from 7.18.0 to 7.18.3|8.8.0 recommended or 8.5.6 LTS or 7.19.19 LTS|
|from 7.17.0 to 7.17.5|8.8.0 recommended or 8.5.6 LTS or 7.19.19 LTS|
|Any earlier versions|8.8.0 recommended or 8.5.6 LTS or 7.19.19 LTS|
h2. Server

Atlassian recommends that Confluence Server customers upgrade to the latest 8.5.x LTS version. If you are unable to do so, upgrade your instance to one of the specified supported fixed versions:
||Affected versions||Fixed versions||
|from 8.5.0 to 8.5.4 LTS|8.5.5 LTS or 8.5.6 LTS recommended|
|from 8.4.0 to 8.4.5|8.5.6 LTS recommended|
|from 8.3.0 to 8.3.4|8.5.6 LTS recommended|
|from 8.2.0 to 8.2.3|8.5.6 LTS recommended|
|from 8.1.0 to 8.1.4|8.5.6 LTS recommended|
|from 8.0.0 to 8.0.4|8.5.6 LTS recommended|
|from 7.20.0 to 7.20.3|8.5.6 LTS recommended|
|from 7.19.0 to 7.19.17 LTS|8.5.6 LTS recommended or 7.19.18 LTS or 7.19.19 LTS|
|from 7.18.0 to 7.18.3|8.5.6 LTS recommended or 7.19.19 LTS|
|from 7.17.0 to 7.17.5|8.5.6 LTS recommended or 7.19.19 LTS|
|Any earlier versions|8.5.6 LTS recommended or 7.19.19 LTS|

See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center and Server from the download center ([https://www.atlassian.com/software/confluence/download-archives]).

The National Vulnerability Database provides the following description for this vulnerability: A serialization vulnerability in logback receiver component part of
logback version 1.4.11 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.