CVE-2021-3943
CRITICALCVSS 9.8/10EPSS 2.38%
Last modified
CVE-2021-3943 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 2.38% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Moodle | Moodle | >= 3.9.0, <= 3.9.10 |
| Moodle | Moodle | >= 3.10.0, <= 3.10.7 |
| Moodle | Moodle | >= 3.11.0, <= 3.11.3 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2021963Issue Tracking, Third Party Advisory
- https://moodle.org/mod/forum/discuss.php?d=429095Patch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2021963Issue Tracking, Third Party Advisory
- https://moodle.org/mod/forum/discuss.php?d=429095Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3943?
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.
How severe is CVE-2021-3943?
CVE-2021-3943 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.38% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3943?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3943?
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Scan your code nowSource: NVD / NIST