CVE-2021-43559

Name: CVE-2021-43559
Creator: NVD / NIST
Published: 2021-11-22T16:15:08.287+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.61%

Last modified Jun 17, 2026

CVE-2021-43559 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. The "delete related badge" functionality did not include the necessary token check to prevent a CSRF risk.. EPSS estimates a 0.61% chance of exploitation in the next 30 days.

Description

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. The "delete related badge" functionality did not include the necessary token check to prevent a CSRF risk.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.61%

44.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Moodle	Moodle	<= 3.8.8
Moodle	Moodle	>= 3.9.0, < 3.9.11
Moodle	Moodle	>= 3.10.0, < 3.10.8
Moodle	Moodle	>= 3.11.0, < 3.11.4
Fedoraproject	Extra Packages For Enterprise Linux	7.0
Fedoraproject	Fedora	35

References

https://bugzilla.redhat.com/show_bug.cgi?id=2021517Issue Tracking, Third Party Advisory
https://moodle.org/mod/forum/discuss.php?d=429099Patch, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2021517Issue Tracking, Third Party Advisory
https://moodle.org/mod/forum/discuss.php?d=429099Patch, Vendor Advisory

Timeline

Published: Nov 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43559?

How severe is CVE-2021-43559?

CVE-2021-43559 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.61% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43559?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43559?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST