RCE in Moodle
CVE-2021-21809
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 vu…
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.242 (97.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Moodle — versions 3.10.0
- N/a Moodle — versions Moodle 3.10
Weakness classification (CWE)
Public proof-of-concept exploits
References
- talos-cna@cisco.com (Exploit, Third Party Advisory, x_refsource_MISC)
- talos-cna@cisco.com (Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-21809?
- CVE-2021-21809 is a critical-severity vulnerability in Moodle, classified under OS Command Injection. CVSS score: 9.1/10. Published 2021-06-23.
- How severe is CVE-2021-21809?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2021-21809 known to be exploited?
- 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.