Is CVE-2021-20185 in the CISA KEV catalog?

No. CVE-2021-20185 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20185?

CVE-2021-20185 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-20185?

CVE-2021-20185 has an EPSS score of 1.38% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20185?

Upgrade moodle to 3.9.4 or later.

CVE & CISA-KEV Catalog

CVE-2021-20185

MEDIUM

5.3

CVSS v3

NVD

Description

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.

CWE-400Resource Exhaustion CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

moodleNVD

Affected:>= 3.9.0, < 3.9.4Fixed in:3.9.4CVE-2021-20185derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

1.38%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Patch1

moodle.org

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	89%	-	Fix

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Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.