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CVE-2021-3943 — Vulnerability in moodle/moodle — CVE Details

CRITICAL

Moodle vulnerable to RCE via unsafe deserialization

Published November 23, 2021Updated February 16, 2024Source: osv

Summary

A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A remote code execution risk when restoring backup files was identified.

Advisory Timeline

  • First published November 23, 2021 (1785 days ago).
  • Last revised February 16, 2024 — 815 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer
Update moodle/moodle to 3.11.4 or later
composer require "moodle/moodle:^3.11.4"
Composer
Update moodle/moodle to 3.9.11 or later
composer require "moodle/moodle:^3.9.11"
Composer
Update moodle/moodle to 3.10.8 or later
composer require "moodle/moodle:^3.10.8"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: packagist (1).

PackageEcosystemAffectedFixed In
moodle/moodle
packagist
v3.11.0, v3.11.0-beta, v3.11.0-rc1, v3.11.0-rc2 (+3 more)3.11.4
moodle/moodle
packagist
v3.9.0, v3.9.0-beta, v3.9.0-rc1, v3.9.0-rc2 (+11 more)3.9.11
moodle/moodle
packagist
v3.10.0, v3.10.0-beta, v3.10.0-rc1, v3.10.0-rc2 (+7 more)3.10.8

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-20
    Improper Input ValidationMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2021-3943?
Moodle vulnerable to RCE via unsafe deserialization This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2021-3943?
CVE-2021-3943 affects moodle/moodle. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-3943 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-8jhp-2gcr-qw96
BIT-moodle-2021-3943

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