{"schema_version":"1.9.0","id":"CVE-2021-22881","published":"2021-02-11T18:15:17.460Z","modified":"2026-09-09T03:30:23.996442455Z","aliases":["GHSA-8877-prq4-9xfw"],"related":["openSUSE-SU-2024:11318-1","openSUSE-SU-2024:11821-1"],"details":"The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain \"allowed host\" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rails/rails","events":[{"introduced":"66cabeda2c46c582d19738e1318be8d59584cc5b"},{"fixed":"c5929d5eb55b749bc124b3ccc2d79323d015701f"},{"introduced":"914caca2d31bd753f47f9168f2a375921d9e91cc"},{"fixed":"130c128eae233bf71231c73b9c3c3b3f3ede918b"}],"database_specific":{"cpe":"cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"6.0.0"},{"fixed":"6.0.3.5"},{"introduced":"6.1.0"},{"fixed":"6.1.2.1"}],"source":"CPE_RANGE"}}],"versions":["v6.1.2","v6.0.3.4","v6.1.1","v6.1.0","v6.0.3.3","v6.0.3.2","v6.0.3.1","v6.0.3","v6.0.3.rc1","v6.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-22881.json"}}],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3/"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/05/05/2"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/08/20/1"},{"type":"FIX","url":"http://www.openwall.com/lists/oss-security/2021/12/14/5"},{"type":"FIX","url":"https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/"},{"type":"FIX","url":"https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130"},{"type":"FIX","url":"https://hackerone.com/reports/1047447"}],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"33"},{"last_affected":"33"}],"source":"CPE_STRING","vendor_product":"fedoraproject:fedora"}]},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}