7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

Concerned about an active attack path?

Talk to our security experts and see Miggo in action.

Miggo Vulnerability Database

→

CVE-2021-36395

CVE-2021-36395: Moodle vulnerable to Uncontrolled Resource Consumption

In Moodle, the file repository's URL parsing required additional recursion handling to mitigate the risk of recursion denial of service.

(GitHub Advisory)

Miggo Vulnerability Database

→

CVE-2021-36395

CVE-2021-36395:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

Is this CVE running in your environment?

Easily map the attack path and prioritize which CVEs are a threat to your organization

Validate Exposure

Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
moodle/moodle	composer	>= 3.11.0-beta, < 3.11.1	3.11.1
moodle/moodle	composer	>= 3.10.0-beta, < 3.10.5	3.10.5
moodle/moodle	composer	< 3.9.8	3.9.8

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability centers on uncontrolled recursion in URL parsing via cURL. Moodle's file repository uses cURL to fetch external files. The security advisory specifically mentions 'recursive cURL' as the attack vector, indicating two key points of failure: 1) The repository's cURL implementation (repository_curl class) handling file downloads, and 2) The core cURL wrapper responsible for HTTP requests. Both would require redirect handling improvements. The functions are inferred because: 1) repository_curl::get_file is the entry point for file downloads from URLs, and 2) curl::http_request is Moodle's main cURL implementation where redirect following would be managed. The lack of recursion depth tracking in these functions matches the CWE-674 (uncontrolled recursion) and CWE-400 (resource consumption) descriptions.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

Vulnerability Intelligence
Miggo AI

Unlock WAF rules for this CVE

Generate vendor-ready rules for the observed attack patterns, plus reasoning and safe deployment guidance

Get WAF rules

WAF Protection Rules

WAF Rule

W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.

Reasoning

*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.