Is CVE-2021-36403 in the CISA KEV catalog?

No. CVE-2021-36403 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-36403?

CVE-2021-36403 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-36403?

CVE-2021-36403 has an EPSS score of 0.53% (40th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-36403?

Upgrade moodle to 3.11.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-36403

MEDIUM

5.3

CVSS v3

NVD

Description

In Moodle, in some circumstances, email notifications of messages could have the link back to the original message hidden by HTML, which may pose a phishing risk.

CWE-912

How to fix

Remediation Available

moodleNVD

Affected:>= 3.11.0, < 3.11.1Fixed in:3.11.1CVE-2021-36403derived 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

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.53%probability of exploitation in 30 days

40thpercentile

Moderate risk: more likely to be exploited than 40% of all known CVEs.

References

Patch1

moodle.org

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Markdown

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HTML

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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 2025-03-07.