What is CVE-2021-36396?

CVE-2021-36396 is a high-severity vulnerability in Moodle, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2023-03-06.

How severe is CVE-2021-36396?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-36396 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SSRF in Moodle

CVE-2021-36396

In Moodle, insufficient redirect handling made it possible to blindly bypass cURL blocked hosts/allowed ports restrictions, resulting in a blind SSRF risk.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.014 (70.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Moodle
N/a Moodle — versions 3.11, 3.10 to 3.10.4, 3.9 to 3.9.7 and earlier unsupported versions

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

Public proof-of-concept exploits

References

patrick@puiterwijk.org (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-36396?: CVE-2021-36396 is a high-severity vulnerability in Moodle, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2023-03-06.
How severe is CVE-2021-36396?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-36396 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.