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CVE-2021-36393

60
FAUCET Score

CVE-2021-36393 is a critical SQL injection vulnerability affecting Moodle, specifically within the library responsible for fetching a user's recent courses. This flaw allows an unauthenticated attacker to execute arbitrary SQL commands, leading to complete compromise of confidentiality, integrity, and availability. Despite its critical CVSS score of 9.8 and high FAUCET Risk Score of 96/100, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.9.8CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
>= 3.10.0, < 3.10.5CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
>= 3.11.0, < 3.11.1CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
52.30%
Probability of exploitation in next 30 days
EPSS Percentile
98.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.5230 is in the 97th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 3.11.1
composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 3.10.5
composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 3.9.8

Vendor Advisories (1)

composerGHSA-f46j-r7q3-6cm2critical

Moodle SQL Injection vulnerability

Mar 6, 2023

References

moodle.org / mod/forum/discuss.php
PatchVendor Advisory