{"api_version":"1","generated_at":"2026-04-23T11:36:20+00:00","cve":"CVE-2021-22881","urls":{"html":"https://cve.report/CVE-2021-22881","api":"https://cve.report/api/cve/CVE-2021-22881.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-22881","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-22881"},"summary":{"title":"CVE-2021-22881","description":"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.","state":"PUBLIC","assigner":"support@hackerone.com","published_at":"2021-02-11 18:15:00","updated_at":"2023-11-07 03:30:00"},"problem_types":["CWE-601"],"metrics":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2021/05/05/2","name":"[oss-security] 20210505 [CVE-2021-22903] Possible Open Redirect Vulnerability in Action Pack","refsource":"MLIST","tags":[],"title":"oss-security - [CVE-2021-22903] Possible Open Redirect Vulnerability in Action Pack","mime":"text/x-ruby","httpstatus":"200","archivestatus":"404"},{"url":"http://www.openwall.com/lists/oss-security/2021/12/14/5","name":"[oss-security] 20211214 [CVE-2021-44528] Possible Open Redirect in Host Authorization Middleware","refsource":"MLIST","tags":[],"title":"oss-security - [CVE-2021-44528] Possible Open Redirect in Host Authorization Middleware","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130","name":"https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130","refsource":"MISC","tags":["Mitigation","Patch","Vendor Advisory"],"title":"[CVE-2021-22881] Possible Open Redirect in Host Authorization Middleware - Security Announcements - Ruby on Rails Discussions","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://hackerone.com/reports/1047447","name":"https://hackerone.com/reports/1047447","refsource":"MISC","tags":["Exploit","Patch","Third Party Advisory"],"title":"HackerOne","mime":"text/x-ruby","httpstatus":"200","archivestatus":"200"},{"url":"http://www.openwall.com/lists/oss-security/2021/08/20/1","name":"[oss-security] 20210819 [CVE-2021-22942] Possible Open Redirect in Host Authorization Middleware","refsource":"MLIST","tags":[],"title":"oss-security - [CVE-2021-22942] Possible Open Redirect in Host Authorization Middleware","mime":"text/x-ruby","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3/","name":"FEDORA-2021-b571fca1b8","refsource":"FEDORA","tags":[],"title":"[SECURITY] Fedora 33 Update: rubygem-actionpack-6.0.3.4-2.fc33 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/","name":"https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"[CVE-2021-22881] Faille de sécurité dans le middleware HostAuthorization – Benjamin Bouchet","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3/","name":"FEDORA-2021-b571fca1b8","refsource":"","tags":[],"title":"[SECURITY] Fedora 33 Update: rubygem-actionpack-6.0.3.4-2.fc33 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-22881","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22881","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"22881","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"33","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"22881","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"rubyonrails","cpe5":"rails","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"22881","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"rubyonrails","cpe5":"rails","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-22881","qid":"180343","title":"Debian Security Update for rails (CVE-2021-22881)"},{"cve":"CVE-2021-22881","qid":"281541","title":"Fedora Security Update for rubygem (FEDORA-2021-b571fca1b8)"},{"cve":"CVE-2021-22881","qid":"690374","title":"Free Berkeley Software Distribution (FreeBSD) Security Update for rails (8e670b85-706e-11eb-abb2-08002728f74c)"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2021-22881","ASSIGNER":"support@hackerone.com","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"n/a","product":{"product_data":[{"product_name":"https://github.com/rails/rails","version":{"version_data":[{"version_value":"Fixed in 6.1.2.1, 6.0.3.5"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Open Redirect (CWE-601)"}]}]},"references":{"reference_data":[{"refsource":"MISC","name":"https://hackerone.com/reports/1047447","url":"https://hackerone.com/reports/1047447"},{"refsource":"MISC","name":"https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130","url":"https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130"},{"refsource":"MISC","name":"https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/","url":"https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/"},{"refsource":"FEDORA","name":"FEDORA-2021-b571fca1b8","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3/"},{"refsource":"MLIST","name":"[oss-security] 20210505 [CVE-2021-22903] Possible Open Redirect Vulnerability in Action Pack","url":"http://www.openwall.com/lists/oss-security/2021/05/05/2"},{"refsource":"MLIST","name":"[oss-security] 20210819 [CVE-2021-22942] Possible Open Redirect in Host Authorization Middleware","url":"http://www.openwall.com/lists/oss-security/2021/08/20/1"},{"refsource":"MLIST","name":"[oss-security] 20211214 [CVE-2021-44528] Possible Open Redirect in Host Authorization Middleware","url":"http://www.openwall.com/lists/oss-security/2021/12/14/5"}]},"description":{"description_data":[{"lang":"eng","value":"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."}]}},"nvd":{"publishedDate":"2021-02-11 18:15:00","lastModifiedDate":"2023-11-07 03:30:00","problem_types":["CWE-601"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":2.7},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":5.8},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":4.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.0","versionEndExcluding":"6.1.2.1","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0.0","versionEndExcluding":"6.0.3.5","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"22881","Ordinal":"197614","Title":"CVE-2021-22881","CVE":"CVE-2021-22881","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"22881","Ordinal":"1","NoteData":"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.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"22881","Ordinal":"2","NoteData":"2021-02-11","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"22881","Ordinal":"3","NoteData":"2021-12-14","Type":"Other","Title":"Modified"}]}}}