{"schema_version":"1.7.3","id":"GHSA-vc47-6rqg-c7f5","published":"2022-11-19T00:30:55Z","modified":"2026-08-13T20:11:58.150676170Z","aliases":["BIT-ruby-2021-33621","BIT-ruby-min-2021-33621","CVE-2021-33621"],"summary":"HTTP response splitting in CGI","details":"Ruby gem cgi.rb prior to versions 0.3.5, 0.2.2 and 0.1.0.2 allow HTTP header injection. If a CGI application using the CGI library inserts untrusted input into the HTTP response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. This issue has been patched in versions 0.3.5, 0.2.2 and 0.1.0.2.","affected":[{"package":{"name":"cgi","ecosystem":"RubyGems","purl":"pkg:gem/cgi"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.3.0"},{"fixed":"0.3.5"}]}],"versions":["0.3.0","0.3.1","0.3.2","0.3.3","0.3.4"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/11/GHSA-vc47-6rqg-c7f5/GHSA-vc47-6rqg-c7f5.json"}},{"package":{"name":"cgi","ecosystem":"RubyGems","purl":"pkg:gem/cgi"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.2.0"},{"fixed":"0.2.2"}]}],"versions":["0.2.0","0.2.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/11/GHSA-vc47-6rqg-c7f5/GHSA-vc47-6rqg-c7f5.json"}},{"package":{"name":"cgi","ecosystem":"RubyGems","purl":"pkg:gem/cgi"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.0.2"}]}],"versions":["0.1.0","0.1.0.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/11/GHSA-vc47-6rqg-c7f5/GHSA-vc47-6rqg-c7f5.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33621"},{"type":"WEB","url":"https://hackerone.com/reports/1204695"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2021-33621.yml"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/06/msg00012.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/09/msg00000.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQR7LWED6VAPD5ATYOBZIGJQPCUBRJBX"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THVTYHHEOVLQFCFHWURZYO7PVUPBHRZD"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YACE6ORF2QBXXBK2V2CM36D7TZMEJVAS"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DQR7LWED6VAPD5ATYOBZIGJQPCUBRJBX"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/THVTYHHEOVLQFCFHWURZYO7PVUPBHRZD"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YACE6ORF2QBXXBK2V2CM36D7TZMEJVAS"},{"type":"WEB","url":"https://security.gentoo.org/glsa/202401-27"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20221228-0004"},{"type":"WEB","url":"https://www.ruby-lang.org/en/news/2022/11/22/http-response-splitting-in-cgi-cve-2021-33621"}],"database_specific":{"cwe_ids":["CWE-436","CWE-74"],"github_reviewed":true,"github_reviewed_at":"2022-11-24T01:59:37Z","nvd_published_at":"2022-11-18T23:15:00Z","severity":"HIGH"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}