VULNERABILITY INTELLIGENCE

CVE-2021-43850

CVSS score6.8 MEDIUM

EPSS probability0.85%

CISA KEVNot currently listed

Published2022-01-04

Last modified2026-06-17

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

Description

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.

Weakness classification

security-advisories@github.com: CWE-20
nvd@nist.gov: NVD-CWE-noinfo

Primary references

security-advisories@github.com — Patch, Third Party Advisory
security-advisories@github.com — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory