CVE-2021-43850: Denial of Service in discourse
First published: Tue Jan 04 2022(Updated: )
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.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Discourse | <2.7.12 | |
| Discourse | =2.8.0-beta1 | |
| Discourse | =2.8.0-beta2 | |
| Discourse | =2.8.0-beta3 | |
| Discourse | =2.8.0-beta4 | |
| Discourse | =2.8.0-beta5 | |
| Discourse | =2.8.0-beta6 | |
| Discourse | =2.8.0-beta7 | |
| Discourse | =2.8.0-beta8 | |
| Discourse | =2.8.0-beta9 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-43850?
CVE-2021-43850 has the potential to cause a Denial of Service attack, especially impacting multisite Discourse instances.
How do I fix CVE-2021-43850?
To remediate CVE-2021-43850, update Discourse to a version greater than 2.7.12 or use the latest beta release.
Which versions of Discourse are affected by CVE-2021-43850?
Versions of Discourse up to 2.7.12 and certain 2.8.0 beta releases are affected by CVE-2021-43850.
Can CVE-2021-43850 affect multisite Discourse installations?
Yes, CVE-2021-43850 poses a greater risk for multisite Discourse installations.
What specific functionality is exploited in CVE-2021-43850?
CVE-2021-43850 can be exploited via the '/message-bus/_diagnostics' path to trigger a Denial of Service.
- agent/type
- agent/references
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/weakness
- agent/remedy
- agent/title
- agent/first-publish-date
- agent/description
- agent/last-modified-date
- agent/author
- agent/softwarecombine
- agent/event
- agent/source
- agent/tags
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- collector/nvd-index
- vendor/discourse
- canonical/discourse
- version/discourse/2.8.0-beta1
- version/discourse/2.8.0-beta2
- version/discourse/2.8.0-beta3
- version/discourse/2.8.0-beta4
- version/discourse/2.8.0-beta5
- version/discourse/2.8.0-beta6
- version/discourse/2.8.0-beta7
- version/discourse/2.8.0-beta8
- version/discourse/2.8.0-beta9