What is the severity of CVE-2021-43794?

CVE-2021-43794 has a severity rating that reflects its ability to cause a partial denial-of-service for anonymous users.

How do I fix CVE-2021-43794?

To fix CVE-2021-43794, you should upgrade your Discourse installation to version 2.7.11 or later.

What types of users are affected by CVE-2021-43794?

CVE-2021-43794 affects anonymous users who are not logged into the Discourse platform.

What does CVE-2021-43794 allow an attacker to do?

CVE-2021-43794 allows an attacker to poison the cache, leading to the presentation of a JSON blob instead of the intended HTML page.

Is CVE-2021-43794 a widespread issue?

CVE-2021-43794 is specific to certain versions of Discourse, but the impact can affect any site using those versions.

Vulnerability/
CVE-2021-43794

medium

5.3

CWE

610

1/12/2021

21/11/2024

CVE-2021-43794: Anonymous user cache poisoning via development-mode header in Discourse

First published: Wed Dec 01 2021(Updated: )

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.

Credit: security-advisories@github.com security-advisories@github.com

Affected Software	Affected Version	How to fix
Discourse	<2.7.11

Remedy

https://github.com/discourse/discourse/commit/2da0001965c6d8632d723c46ea5df9f22a1a23f1

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2021-43794?
CVE-2021-43794 has a severity rating that reflects its ability to cause a partial denial-of-service for anonymous users.
How do I fix CVE-2021-43794?
To fix CVE-2021-43794, you should upgrade your Discourse installation to version 2.7.11 or later.
What types of users are affected by CVE-2021-43794?
CVE-2021-43794 affects anonymous users who are not logged into the Discourse platform.
What does CVE-2021-43794 allow an attacker to do?
CVE-2021-43794 allows an attacker to poison the cache, leading to the presentation of a JSON blob instead of the intended HTML page.
Is CVE-2021-43794 a widespread issue?
CVE-2021-43794 is specific to certain versions of Discourse, but the impact can affect any site using those versions.

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