Improper input validation in Discourse
CVE-2021-43850
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (56.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Discourse — versions >= 2.8.0.beta, < 2.8.0.beta10, 2.8.0, < 2.7.12
Weakness classification (CWE)
References
- github.com/discourse/discourse/security/advisories/GHSA-59jr-pj65-qmvr (Exploit, Third Party Advisory)
- github.com/discourse/discourse/commit/7a8ec129fb54f188b2da6588c9d24d3a36eb0d39 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-43850?
- CVE-2021-43850 is a medium-severity vulnerability in Discourse, classified under Improper Input Validation. CVSS score: 6.8/10. Published 2022-01-04.
- How severe is CVE-2021-43850?
- Medium severity. CVSS v3 base score is 6.8 out of 10.