What is CVE-2021-43794?

CVE-2021-43794 is a medium-severity vulnerability in Discourse, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 5.3/10. Published 2021-12-01.

How severe is CVE-2021-43794?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Discourse

CVE-2021-43794

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.

EPSS: 0.010 (59.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Discourse — versions stable < 2.7.11, beta < 2.8.0.beta9, tests-passed < 2.8.0.beta9

Weakness classification (CWE)

CWE-610 — Externally Controlled Reference to a Resource in Another Sphere

References

security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)

Frequently asked questions

What is CVE-2021-43794?: CVE-2021-43794 is a medium-severity vulnerability in Discourse, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 5.3/10. Published 2021-12-01.
How severe is CVE-2021-43794?: Medium severity. CVSS v3 base score is 5.3 out of 10.