CVE-2021-20187

mediumpriority · track · 30EPSS 0.016 · 76 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.59% (76th) EPSS

CVSS 6.5 · medium

Is it mine?

18 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

7.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–7.2

v2.06.5mediumAV:N/AC:L/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8 · impact 6.4

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.2 · impact 5.9

v3.17.2highAV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV

v3.16.6mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-829USprimaryCWE-829USCWE-94USCWE-94USCWE-94US

affected products (18)

Products and version ranges known to be affected.

n/a Moodle≤ moodle 3.10.1, moodle 3.9.4, moodle 3.8.7, moodle 3.5.16enisa_euvdEU
Мартин Догиамас Moodle≤ 3.5.16fstec_bduRU
Мартин Догиамас Moodle3.10.0 → 3.10.1fstec_bduRU
Мартин Догиамас Moodle3.8.0 → 3.8.7fstec_bduRU
Мартин Догиамас Moodle3.9.0 → 3.9.4fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.2 Муромfstec_bduRU
moodle moodle< 3.5.16nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle= 3.10.0nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle3.8.0 → 3.8.7nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle3.9.0 → 3.9.4nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
Bitnami moodle< 3.5.16osvUSpkg:bitnami/moodle
Bitnami moodle3.10.0 → 3.10.1osvUSpkg:bitnami/moodle
Bitnami moodle3.8.0 → 3.8.7osvUSpkg:bitnami/moodle
Bitnami moodle3.9.0 → 3.9.4osvUSpkg:bitnami/moodle
Packagist moodle/moodle3.10 → 3.10.1osvUSpkg:composer/moodle/moodle
Packagist moodle/moodle3.5 → 3.5.16osvUSpkg:composer/moodle/moodle
Packagist moodle/moodle3.8 → 3.8.7osvUSpkg:composer/moodle/moodle
Packagist moodle/moodle3.9 → 3.9.4osvUSpkg:composer/moodle/moodle

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-2jrm-gww7-wch2Moodle Arbitrary PHP code execution by site admins via Shibboleth configuration2022-05-24ghsa · osvUS
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.
BIT-moodle-2021-201872024-03-06vendor · osvUS
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.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv nvd NVD CVE.org MITRE

published 2021-01-28modified 2026-06-17

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+455 more

references (6)

External citations — patches, advisories, analysis.

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