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Vulnerability details: VCID-2kxn-yh3g-tkb9
Vulnerability ID VCID-2kxn-yh3g-tkb9
Aliases CVE-2021-36394
GHSA-2563-fp9c-mgm8
Summary Moodle Session Fixation vulnerability In Moodle, a remote code execution risk was identified in the Shibboleth authentication plugin.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-384 Session Fixation
CWE-94 Improper Control of Generation of Code ('Code Injection')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.20327 https://api.first.org/data/v1/epss?cve=CVE-2021-36394
epss 0.20327 https://api.first.org/data/v1/epss?cve=CVE-2021-36394
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-2563-fp9c-mgm8
cvssv3.1 9.8 https://github.com/moodle/moodle
generic_textual CRITICAL https://github.com/moodle/moodle
cvssv3.1 9.8 https://moodle.org/mod/forum/discuss.php?d=424799
generic_textual CRITICAL https://moodle.org/mod/forum/discuss.php?d=424799
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-36394
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2021-36394
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-36394
https://github.com/moodle/moodle
https://moodle.org/mod/forum/discuss.php?d=424799
https://nvd.nist.gov/vuln/detail/CVE-2021-36394
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:*:*:*:*:*:*:*:*
GHSA-2563-fp9c-mgm8 https://github.com/advisories/GHSA-2563-fp9c-mgm8
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:U/C:H/I:H/A:H Found at https://moodle.org/mod/forum/discuss.php?d=424799
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:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-36394
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 0.95229
EPSS Score 0.20327
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:15:19.006462+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-2563-fp9c-mgm8/GHSA-2563-fp9c-mgm8.json 36.1.3