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)

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.014 (72.1th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-36396: held from 0.014 to 0.014.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

  • Moodle
  • Moodle — versions 3.11, 3.10 to 3.10.4, 3.9 to 3.9.7 and earlier unsupported versions

Weakness classification (CWE)

Public proof-of-concept exploits

References

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.