# CVE-2026-21577

> CVE-2026-21577. CVSS 6.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-21577
Last updated: 2026-10-24T19:10:00Z

- Published: 2026-07-21 17:00 UTC · Updated: 2026-10-24 19:10 UTC · Assigner: atlassian
- CVSS: 6.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.43%, 37th percentile (scored 2026-10-25)
- CISA KEV: no

## Description

This High severity DoS (Denial of Service) vulnerability was introduced in versions 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0 and 10.2.0 of Confluence Data Center.  This DoS (Denial of Service) vulnerability, with a CVSS Score of 7.1, allows an authenticated 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 9.2: Upgrade to a release greater than or equal to 9.2.17   Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.7  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 Penetration Testing program.

## Affected vendors and products

- Atlassian: Confluence Data Center

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-21577)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-21577)
- [https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999345](https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999345)
- [https://jira.atlassian.com/browse/CONFSERVER-104334](https://jira.atlassian.com/browse/CONFSERVER-104334)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-21577 · Markdown: https://rewindex.com/cve/CVE-2026-21577.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-21577 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:07.324Z