CVE-2025-22166: Atlassian Confluence Data Center

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

This High severity DoS (Denial of Service) vulnerability was introduced in version 2.0 of Confluence Data Center. This DoS (Denial of Service) vulnerability, with a CVSS Score of 8.3, allows an attacker to cause a resource to be unavailable for its intended users by temporarily or indefinitely disrupting services of a host connected to a network. Atlassian recommends that Confluence 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: Confluence Data Center and Server 8.5: Upgrade to a release greater than or equal to 8.5.25 Confluence Data Center and Server 9.2: Upgrade to a release greater than or equal to 9.2.7 Confluence Data Center and Server 10.0: Upgrade to a release greater than or equal to 10.0.2 See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center from the download center ([https://www.atlassian.com/software/confluence/download-archives]). This vulnerability was reported via our Atlassian (Internal) program.

Affected products

• Atlassian Confluence Data Center: from 8.5.0, before 8.5.25 (fixed in 8.5.25); from 9.2.0, before 9.2.7 (fixed in 9.2.7); from 10.0.0, before 10.0.2 (fixed in 10.0.2)
• Atlassian Confluence Server: from 8.5.0, before 8.5.25 (fixed in 8.5.25); from 9.2.0, before 9.2.7 (fixed in 9.2.7); from 10.0.0, before 10.0.2 (fixed in 10.0.2)

Published 2025-10-21. Last modified 2026-10-08.