{"cve":"CVE-2021-33621","nvd":{"published":"2022-11-18T23:15:18.987","modified":"2026-06-17T03:54:52.923","status":"Modified","description":"The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-74"],"references":["https://lists.debian.org/debian-lts-announce/2023/06/msg00012.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQR7LWED6VAPD5ATYOBZIGJQPCUBRJBX/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THVTYHHEOVLQFCFHWURZYO7PVUPBHRZD/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YACE6ORF2QBXXBK2V2CM36D7TZMEJVAS/","https://security.gentoo.org/glsa/202401-27"],"products":["fedoraproject:fedora","ruby-lang:cgi","ruby-lang:ruby"],"source":"nvd","synced_at":"2026-10-19T21:37:28.463369388+00:00"},"epss":{"cve":"CVE-2021-33621","score":0.02452,"percentile":0.84396,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vc47-6rqg-c7f5","url":"https://osv.dev/vulnerability/GHSA-vc47-6rqg-c7f5","summary":"HTTP response splitting in CGI","modified":"2026-08-13T20:11:58.150676170Z","packages":[{"ecosystem":"RubyGems","name":"cgi","purl":"pkg:gem/cgi","ranges":[">=0.3.0 <0.3.5"],"fixed":["0.3.5"]},{"ecosystem":"RubyGems","name":"cgi","purl":"pkg:gem/cgi","ranges":[">=0.2.0 <0.2.2"],"fixed":["0.2.2"]},{"ecosystem":"RubyGems","name":"cgi","purl":"pkg:gem/cgi","ranges":["<0.1.0.2"],"fixed":["0.1.0.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}