CVE-2021-20187

HIGHNVD 7.27.2—

7.2

It was found in Moodle before version 3.10.1, 3.9.4, 3.8.7 and 3.5.16 that it was possible for site administrators to execute arbitrary PHP scripts via a PHP include used during Shibboleth authentication.

CVSS v3: 7.2
EG Score: 7.2(medium)
EPSS: 68.3%
KEV: Not listed

Published

January 28, 2021

Last Modified

November 21, 2024

References (2)

secalert@redhathttps://moodle.org/mod/forum/discuss.php?d=417171
af854a3a-2127-422b-91ae-364da2661108https://moodle.org/mod/forum/discuss.php?d=417171

Affected Packages

(1 across 1 ecosystem)

Packagist(1)

Package	Vulnerable range	Fixed in	Dependents
moodle/moodle	v3.10.0, v3.10.0-beta, v3.10.0-rc1, v3.10.0-rc2	3.10.1	—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-26 21:32 UTCEG score recompute
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:49 UTCepss_batch

Frequently asked(5)

What is CVE-2021-20187?

CVE-2021-20187 is a high vulnerability published on January 28, 2021. It was found in Moodle before version 3.10.1, 3.9.4, 3.8.7 and 3.5.16 that it was possible for site administrators to execute arbitrary PHP scripts via a PHP include used during Shibboleth authentication.

When was CVE-2021-20187 disclosed?

CVE-2021-20187 was first published in the National Vulnerability Database on January 28, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-20187 actively exploited?

CVE-2021-20187 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 68.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-20187?

CVE-2021-20187 has a CVSS v3 base score of 7.2 (NVD).

How do I remediate CVE-2021-20187?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20187, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-20187

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Is Your Infrastructure Affected by CVE-2021-20187?

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