What is the severity of CVE-2021-3943?

CVE-2021-3943 has a critical severity rating due to its potential for remote code execution.

How do I fix CVE-2021-3943?

To fix CVE-2021-3943, upgrade Moodle to version 3.11.4 or later, or to 3.9.11.

Which versions of Moodle are affected by CVE-2021-3943?

CVE-2021-3943 affects Moodle versions 3.11 to 3.11.3, 3.10 to 3.10.7, and 3.9 to 3.9.10.

What vulnerability does CVE-2021-3943 address?

CVE-2021-3943 addresses a remote code execution risk when restoring backup files in Moodle.

How can I determine if my Moodle installation is vulnerable to CVE-2021-3943?

Check the installed version of Moodle against the affected versions listed for CVE-2021-3943 to determine vulnerability.

Vulnerability/
CVE-2021-3943

critical

9.8

CWE

10/11/2021

22/11/2021

3/8/2024

CVE-2021-3943: Input Validation

First published: Wed Nov 10 2021(Updated: )

A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A remote code execution risk when restoring backup files was identified.

Credit: patrick@puiterwijk.org

Affected Software	Affected Version	How to fix
redhat/moodle	<3.11.4	3.11.4
redhat/moodle 3.10.8 and moodle	<3.9.11	3.9.11
Moodle	>=3.9.0<=3.9.10
Moodle	>=3.10.0<=3.10.7
Moodle	>=3.11.0<=3.11.3

Remedy

https://moodle.org/mod/forum/discuss.php?d=429095

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2021-3943?
CVE-2021-3943 has a critical severity rating due to its potential for remote code execution.
How do I fix CVE-2021-3943?
To fix CVE-2021-3943, upgrade Moodle to version 3.11.4 or later, or to 3.9.11.
Which versions of Moodle are affected by CVE-2021-3943?
CVE-2021-3943 affects Moodle versions 3.11 to 3.11.3, 3.10 to 3.10.7, and 3.9 to 3.9.10.
What vulnerability does CVE-2021-3943 address?
CVE-2021-3943 addresses a remote code execution risk when restoring backup files in Moodle.
How can I determine if my Moodle installation is vulnerable to CVE-2021-3943?
Check the installed version of Moodle against the affected versions listed for CVE-2021-3943 to determine vulnerability.

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