CVE-2021-21809
9.1
CRITICAL · CVSS 3.1 · EPSS 24.2% (pctl 98)
Patch early
EPSS 24.2% — above the 10% action threshold.
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.
Scoring
| CVSS | 9.1 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 24.17% — more likely to be exploited than 98% of all CVEs |
| Weakness | CWE-78 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-06-23 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| moodle | moodle |
References
- http://packetstormsecurity.com/files/164481/Moodle-SpellChecker-Path-Authenticated-Remote-Command-Execution.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1277
- http://packetstormsecurity.com/files/164481/Moodle-SpellChecker-Path-Authenticated-Remote-Command-Execution.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1277
→ the Explorer · watch your stack · NVD