CVE-2021-36396

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Complete

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2021-07-12 CVE Reserved
2023-03-06 CVE Published
2024-07-07 First Exploit
2025-03-05 CVE Updated
2025-12-31 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

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

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://github.com/T0X1Cx/CVE-2021-36396-Exploit	2024-07-07

URL	Date	SRC
https://moodle.org/mod/forum/discuss.php?d=424802	2023-03-13

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Moodle Search vendor "Moodle"		Moodle Search vendor "Moodle" for product "Moodle"				< 3.9.8 Search vendor "Moodle" for product "Moodle" and version " < 3.9.8"		-		Affected
Moodle Search vendor "Moodle"		Moodle Search vendor "Moodle" for product "Moodle"				>= 3.10.0 < 3.10.5 Search vendor "Moodle" for product "Moodle" and version " >= 3.10.0 < 3.10.5"		-		Affected
Moodle Search vendor "Moodle"		Moodle Search vendor "Moodle" for product "Moodle"				>= 3.11.0 < 3.11.1 Search vendor "Moodle" for product "Moodle" and version " >= 3.11.0 < 3.11.1"		-		Affected