{"id":"CVE-2021-21809","details":"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.","aliases":["BIT-moodle-2021-21809","GHSA-c7jj-vfmr-j9mj"],"modified":"2026-05-18T18:05:43.775122Z","published":"2021-06-23T22:15:08.407Z","references":[{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/164481/Moodle-SpellChecker-Path-Authenticated-Remote-Command-Execution.html"},{"type":"EVIDENCE","url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1277"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/moodle/moodle","events":[{"introduced":"0"},{"last_affected":"ec58cefefb2722f61f77c9a2b6a12d40a8c078a0"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"3.10.0-NA"}],"source":"CPE_FIELD","cpe":"cpe:2.3:a:moodle:moodle:3.10.0:-:*:*:*:*:*:*"}}],"versions":["v3.10.0-rc1","v3.10.0","v3.10.0-rc2","v3.10.0-beta","v3.9.0-rc2","v3.9.0","v3.9.0-rc3","v3.9.0-rc1","v3.9.0-beta","v3.8.0","v3.8.0-rc1","v3.8.0-beta","v3.7.0","v3.7.0-rc2","v3.7.0-rc1","v3.7.0-beta","v3.6.0","v3.6.0-rc2","v3.6.0-rc3","v3.6.0-rc1","v3.6.0-beta","v3.5.0","v3.5.0-rc1","v3.5.0-beta","v3.4.0","v3.4.0-rc2","v3.4.0-rc3","v3.4.0-rc1","v3.4.0-beta","v3.3.0","v3.3.0-rc3","v3.3.0-rc2","v3.3.0-rc1","v3.3.0-beta","v3.2.0-rc2","v3.2.0","v3.2.0-rc4","v3.2.0-beta","v3.2.0-rc5","v3.2.0-rc3","v3.2.0-rc1","v3.1.0-beta","v3.1.0","v3.1.0-rc2","v3.1.0-rc1","v3.0.0-rc3","v3.0.0","v3.0.0-rc4","v3.0.0-rc2","v3.0.0-rc1","v3.0.0-beta","v2.9.0","v2.9.0-rc2","v2.9.0-rc1","v2.9.0-beta","v2.8.0","v2.8.0-rc2","v2.8.0-rc1","v2.8.0-beta","v2.7.0","v2.7.0-rc2","v2.7.0-rc1","v2.7.0-beta","v2.6.0","v2.6.0-rc1","v2.6.0-beta","v2.5.0","v2.5.0-rc1","v2.5.0-beta","v2.4.0-beta","v2.4.0-rc1","v2.4.0","v2.3.0","v2.3.0-rc1","v2.3.0-beta","v2.2.0","v2.2.0-rc1","v2.2.0-beta","v2.1.0","v2.0.1","v2.0.0","v2.0.0-rc2","v2.0.0-rc1","v1.3.0","v1.2.1","v1.2.0","v1.1.1","v1.1.0","v1.0.9","v1.0.8","v1.0.7","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-21809.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"}]}