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Vulnerability details: VCID-4dgg-buqq-9fdt
Vulnerability ID VCID-4dgg-buqq-9fdt
Aliases CVE-2021-20187
GHSA-2jrm-gww7-wch2
Summary Moodle Arbitrary PHP code execution by site admins via Shibboleth configuration 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.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-829 Inclusion of Functionality from Untrusted Control Sphere
CWE-94 Improper Control of Generation of Code ('Code Injection')
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00683 https://api.first.org/data/v1/epss?cve=CVE-2021-20187
epss 0.00683 https://api.first.org/data/v1/epss?cve=CVE-2021-20187
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-2jrm-gww7-wch2
cvssv3.1 7.2 https://github.com/moodle/moodle
generic_textual HIGH https://github.com/moodle/moodle
cvssv3.1 7.2 https://moodle.org/mod/forum/discuss.php?d=417171
generic_textual HIGH https://moodle.org/mod/forum/discuss.php?d=417171
cvssv2 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-20187
cvssv3.1 7.2 https://nvd.nist.gov/vuln/detail/CVE-2021-20187
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2021-20187
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-20187
https://github.com/moodle/moodle
https://moodle.org/mod/forum/discuss.php?d=417171
https://nvd.nist.gov/vuln/detail/CVE-2021-20187
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:3.10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:moodle:moodle:3.10.0:*:*:*:*:*:*:*
GHSA-2jrm-gww7-wch2 https://github.com/advisories/GHSA-2jrm-gww7-wch2
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/moodle/moodle
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Found at https://moodle.org/mod/forum/discuss.php?d=417171
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20187
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20187
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.70663
EPSS Score 0.00683
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:29:13.492993+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-2jrm-gww7-wch2/GHSA-2jrm-gww7-wch2.json 36.1.3