CVE-2021-43850 MEDIUM

CVE-2021-43850: Denial of Service in discourse

Vendor Discourse
Product discourse
Weakness CWE-20 · Input validation
Published January 4, 2022
Last update April 22, 2025
View on NVD All CVEs

CVSS base score

6.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H

What the vulnerability does

01Description

Discourse is an open source platform for community discussion. In affected versions admins users can trigger a Denial of Service attack via the `/message-bus/_diagnostics` path. The impact of this vulnerability is greater on multisite Discourse instances (where multiple forums are served from a single application server) where any admin user on any of the forums are able to visit the `/message-bus/_diagnostics` path. The problem has been patched. Please upgrade to 2.8.0.beta10 or 2.7.12. No workarounds for this issue exist.

Key dates

02Disclosure timeline

January 4, 2022 CVE published
April 22, 2025 Record updated