CVE-2021-20187 describes a critical vulnerability in Moodle versions prior to 3.10.1, 3.9.4, 3.8.7, and 3.5.16, allowing site administrators to execute arbitrary PHP scripts during Shibboleth authentication. This vulnerability carries a high CVSS score of 7.2, indicating a severe impact with high confidentiality, integrity, and availability compromise possible, requiring high privileges but no user interaction. While the vulnerability is significant, there is no evidence of active exploitation, no known public exploit code (Metasploit, Nuclei, ExploitDB), and it is not listed in CISA's KEV catalog. Community discussion and media coverage are minimal, suggesting limited public awareness or active threat.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.5.16CPE matchmatch criteria | cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* | ||
>= 3.8.0, < 3.8.7CPE matchmatch criteria | cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* | ||
>= 3.9.0, < 3.9.4CPE matchmatch criteria | cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* | ||
3.10.0CPE matchmatch criteria | cpe:2.3:a:moodle:moodle:3.10.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.3 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.