What is CVE-2021-20185?

CVE-2021-20185 is a medium-severity vulnerability in Moodle, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2021-01-28.

How severe is CVE-2021-20185?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2021-20185 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Resource exhaustion in Moodle

CVE-2021-20185

It was found in Moodle before version 3.10.1, 3.9.4, 3.8.7 and 3.5.16 that messaging did not impose a character limit when sending messages, which could result in client-side (browser) denial of service for users receiving very large messages.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.014 (69.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Moodle — versions 3.10.0
N/a Moodle — versions moodle 3.10.1, moodle 3.9.4, moodle 3.8.7, moodle 3.5.16

Weakness classification (CWE)

Public proof-of-concept exploits

jev770/badmoodle-scan

References

secalert@redhat.com (Patch, x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20185?: CVE-2021-20185 is a medium-severity vulnerability in Moodle, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2021-01-28.
How severe is CVE-2021-20185?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2021-20185 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.