CVE-2021-43794
Anonymous user cache poisoning via development-mode header in Discourse
5.3
MEDIUM
CVSS 3.1
EPSS 0.38%
Description
Discourse is an open source discussion platform. In affected versions an attacker can poison the cache for anonymous (i.e. not logged in) users, such that the users are shown a JSON blob instead of the HTML page. This can lead to a partial denial-of-service. This issue is patched in the latest stable, beta and tests-passed versions of Discourse.
How to fix CVE-2021-43794
To remediate CVE-2021-43794, upgrade the affected package to a fixed version below.
- —upgrade to 2.7.11 or later
Is CVE-2021-43794 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 2.7.11
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |