CVE-2021-21809 — CRITICAL (9.1)

Vulnerability Description

A command execution vulnerability exists in the default legacy spellchecker plugin in Moodle 3.10. A specially crafted series of HTTP requests can lead to command execution. An attacker must have administrator privileges to exploit this vulnerabilities.

CVSS Score

9.1

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Moodle	Moodle	3.10.0

Related Weaknesses (CWE)

CWE-78

References

http://packetstormsecurity.com/files/164481/Moodle-SpellChecker-Path-AuthenticatExploitThird Party AdvisoryVDB Entry
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1277ExploitThird Party Advisory
http://packetstormsecurity.com/files/164481/Moodle-SpellChecker-Path-AuthenticatExploitThird Party AdvisoryVDB Entry
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1277ExploitThird Party Advisory

FAQ

What is CVE-2021-21809?

CVE-2021-21809 is a vulnerability with a CVSS score of 9.1 (CRITICAL). A command execution vulnerability exists in the default legacy spellchecker plugin in Moodle 3.10. A specially crafted series of HTTP requests can lead to command execution. An attacker must have admi...

How severe is CVE-2021-21809?

CVE-2021-21809 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2021-21809?

Check the references section above for vendor advisories and patch information. Affected products include: Moodle Moodle.