This High severity Third-Party Dependency vulnerability was introduced in version 5.7.1 of Confluence Data Center and Server.

This Third-Party 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 Confluence 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:

• Confluence Data Center and Server 7.19: Upgrade to a release 7.19.17, or any higher 7.19.x release
• Confluence Data Center and Server 8.3: Upgrade to a release 8.3.4 or any higher 8.3.x release
• Confluence Data Center and Server 8.4: Upgrade to a release 8.4.5 or any higher 8.4.x release
• Confluence Data Center and Server 8.5: Upgrade to a release 8.5.4 or any higher 8.5.x release
• Confluence Data Center and Server 8.6: Upgrade to a release 8.6.2 or any higher 8.6.x release
• Confluence Data Center and Server 8.7: Upgrade to a release 8.7.1 or any higher release

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 vulnerability was discovered in the indexOf function of JSONParserByteArray in JSON Smart versions 1.3 and 2.4 which causes a denial of service (DOS) via a crafted web request.