What is the severity of CVE-2021-21809?

CVE-2021-21809 has been classified as a high-severity vulnerability due to its potential for command execution with administrator privileges.

How do I fix CVE-2021-21809?

To fix CVE-2021-21809, upgrade to a patched version of Moodle, such as 3.11.3 or later.

What versions of Moodle are affected by CVE-2021-21809?

CVE-2021-21809 affects Moodle versions 3.8.0, 3.10.0, and 3.11.2.

What type of vulnerability is CVE-2021-21809?

CVE-2021-21809 is a command execution vulnerability that can be triggered by specially crafted HTTP requests.

Vulnerability/
CVE-2021-21809

critical

9.1

CWE

78 732 77

23/6/2021

24/5/2022

3/8/2024

CVE-2021-21809: OS Command Injection

First published: Wed Jun 23 2021(Updated: )

A command execution vulnerability exists in the default legacy spellchecker plugin in a few Moodle multiple specific versions. A specially crafted series of HTTP requests can lead to command execution. An attacker must have administrator privileges to exploit this vulnerabilities.

Credit: talos-cna@cisco.com talos-cna@cisco.com

Affected Software	Affected Version	How to fix
composer/moodle/moodle	=3.8.0
composer/moodle/moodle	=3.11.2
composer/moodle/moodle	=3.10.0
Moodle	=3.10.0

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Frequently Asked Questions

What is the severity of CVE-2021-21809?
CVE-2021-21809 has been classified as a high-severity vulnerability due to its potential for command execution with administrator privileges.
How do I fix CVE-2021-21809?
To fix CVE-2021-21809, upgrade to a patched version of Moodle, such as 3.11.3 or later.
What versions of Moodle are affected by CVE-2021-21809?
CVE-2021-21809 affects Moodle versions 3.8.0, 3.10.0, and 3.11.2.
Can an attacker exploit CVE-2021-21809 without administrator privileges?
No, an attacker must have administrator privileges to exploit CVE-2021-21809.
What type of vulnerability is CVE-2021-21809?
CVE-2021-21809 is a command execution vulnerability that can be triggered by specially crafted HTTP requests.

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