What is the severity of CVE-2021-20187?

CVE-2021-20187 has a medium severity rating due to the potential for site administrators to execute arbitrary PHP scripts.

How do I fix CVE-2021-20187?

To fix CVE-2021-20187, update Moodle to version 3.10.1, 3.9.4, 3.8.7, or 3.5.16 or later.

Which versions of Moodle are affected by CVE-2021-20187?

Moodle versions prior to 3.10.1, 3.9.4, 3.8.7, and 3.5.16 are vulnerable to CVE-2021-20187.

Can site administrators exploit CVE-2021-20187?

Yes, site administrators can exploit CVE-2021-20187 to execute arbitrary PHP scripts through Shibboleth authentication.

Is there a workaround for CVE-2021-20187?

No official workaround exists for CVE-2021-20187; the only mitigation is to upgrade to the patched versions.

Vulnerability/
CVE-2021-20187

high

7.2

CWE

829 94

28/1/2021

24/5/2022

3/8/2024

CVE-2021-20187: Code Injection

First published: Thu Jan 28 2021(Updated: )

It was found in Moodle before version 3.10.1, 3.9.4, 3.8.7 and 3.5.16 that it was possible for site administrators to execute arbitrary PHP scripts via a PHP include used during Shibboleth authentication.

Credit: secalert@redhat.com secalert@redhat.com

Affected Software	Affected Version	How to fix
composer/moodle/moodle	>=3.10<3.10.1	3.10.1
composer/moodle/moodle	>=3.9<3.9.4	3.9.4
composer/moodle/moodle	>=3.8<3.8.7	3.8.7
composer/moodle/moodle	>=3.5<3.5.16	3.5.16
Moodle	<3.5.16
Moodle	>=3.8.0<3.8.7
Moodle	>=3.9.0<3.9.4
Moodle	=3.10.0

Remedy

https://moodle.org/mod/forum/discuss.php?d=417171

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2021-20187?
CVE-2021-20187 has a medium severity rating due to the potential for site administrators to execute arbitrary PHP scripts.
How do I fix CVE-2021-20187?
To fix CVE-2021-20187, update Moodle to version 3.10.1, 3.9.4, 3.8.7, or 3.5.16 or later.
Which versions of Moodle are affected by CVE-2021-20187?
Moodle versions prior to 3.10.1, 3.9.4, 3.8.7, and 3.5.16 are vulnerable to CVE-2021-20187.
Can site administrators exploit CVE-2021-20187?
Yes, site administrators can exploit CVE-2021-20187 to execute arbitrary PHP scripts through Shibboleth authentication.
Is there a workaround for CVE-2021-20187?
No official workaround exists for CVE-2021-20187; the only mitigation is to upgrade to the patched versions.

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