{"id":"CVE-2021-3943","aliases":["BIT-moodle-2021-3943","EUVD-2021-2325","GHSA-8jhp-2gcr-qw96","UBUNTU-CVE-2021-3943"],"status":"published","title":"Moodle vulnerable to RCE via unsafe deserialization","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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.02395,"percentile":0.84208,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2021-11-22T15:59:29Z","modified":"2026-10-24T10:30:21Z","fixes":[{"ecosystem":"Packagist","package":"moodle/moodle","fixed_in":["3.11.4","3.10.8","3.9.11"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"moodle","fixed_in":["3.9.11","3.10.8","3.11.4"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"moodle/moodle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.11"},{"last_affected":"3.11.3"},{"fixed":"3.11.4"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"moodle/moodle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10"},{"last_affected":"3.10.7"},{"fixed":"3.10.8"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"moodle/moodle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.9"},{"last_affected":"3.9.10"},{"fixed":"3.9.11"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"moodle","ranges":[{"type":"SEMVER","events":[{"introduced":"3.9.0"},{"fixed":"3.9.11"},{"introduced":"3.10.0"},{"fixed":"3.10.8"},{"introduced":"3.11.0"},{"fixed":"3.11.4"}]}]},{"source":"osv","ecosystem":"Packagist","package":"moodle/moodle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.11"},{"fixed":"3.11.4"}]}],"versions":["v3.11.0","v3.11.0-beta","v3.11.0-rc1","v3.11.0-rc2","v3.11.1","v3.11.2","v3.11.3"]},{"source":"osv","ecosystem":"Packagist","package":"moodle/moodle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10"},{"fixed":"3.10.8"}]}],"versions":["v3.10.0","v3.10.0-beta","v3.10.0-rc1","v3.10.0-rc2","v3.10.1","v3.10.2","v3.10.3","v3.10.4","v3.10.5","v3.10.6","v3.10.7"]},{"source":"osv","ecosystem":"Packagist","package":"moodle/moodle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.9"},{"fixed":"3.9.11"}]}],"versions":["v3.9.0","v3.9.0-beta","v3.9.0-rc1","v3.9.0-rc2","v3.9.0-rc3","v3.9.1","v3.9.10","v3.9.2","v3.9.3","v3.9.4","v3.9.5","v3.9.6","v3.9.7","v3.9.8","v3.9.9"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"moodle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.9+dfsg-1","2.7.10+dfsg-1","2.7.11+dfsg-1","2.7.11+dfsg-2","2.7.12+dfsg-1","3.0.3+dfsg-0ubuntu1","3.0.3+dfsg-0ubuntu1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"moodle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.3+dfsg-0ubuntu1","3.0.3+dfsg-0ubuntu1+esm1"]}],"products":[{"vendor":"moodle","product":"moodle"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2021963","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Third Party Advisory","advisory","report","web"]},{"url":"https://moodle.org/mod/forum/discuss.php?d=429095","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","advisory","fix","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3943","tags":["web","advisory"]},{"url":"https://github.com/moodle/moodle/commit/58e8ad852f9e75c8158e5bee02c273383f7d9865","tags":["web"]},{"url":"https://github.com/advisories/GHSA-8jhp-2gcr-qw96"},{"url":"https://ubuntu.com/security/CVE-2021-3943","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3943","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-3943","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.","status":"published","published":"2021-11-22T15:59:29Z","modified":"2024-08-03T17:09:09.615Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-2325","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.","status":"published","published":"2021-11-22T15:59:29Z","modified":"2024-08-03T17:09:09Z","updated_at":"2026-11-03T03:25:11.376657Z"}],"ghsa":[{"id":"GHSA-8jhp-2gcr-qw96","title":"Moodle vulnerable to RCE via unsafe deserialization","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.","status":"published","published":"2021-11-23T00:00:51Z","modified":"2023-07-11T18:17:33Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:36:56.605555Z"}],"nvd":[{"id":"CVE-2021-3943","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.","status":"published","published":"2021-11-22T16:15:07.497Z","modified":"2026-06-17T04:06:14.83Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:07:01.428028Z"}],"osv":[{"id":"CVE-2021-3943","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.","status":"published","published":"2021-11-22T16:15:07.497Z","modified":"2026-10-24T10:30:21.958598817Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:20.843843Z"},{"id":"GHSA-8jhp-2gcr-qw96","title":"Moodle vulnerable to RCE via unsafe deserialization","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.","status":"published","published":"2021-11-23T00:00:51Z","modified":"2024-02-16T08:24:54.773262Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:46:42.437513Z"},{"id":"UBUNTU-CVE-2021-3943","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.","status":"published","published":"2021-11-22T16:15:00Z","modified":"2026-09-23T18:46:11.918971299Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:28.526929Z"},{"id":"BIT-moodle-2021-3943","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.","status":"published","published":"2024-03-06T11:07:54.805Z","modified":"2026-09-08T08:48:14.898658341Z","updated_at":"2026-11-02T15:28:33.469426Z"}]}}