{"id":"UBUNTU-CVE-2021-33621","details":"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.","modified":"2026-05-20T16:06:27.928525633Z","published":"2022-11-18T23:15:00Z","related":["USN-5806-1","USN-5806-2","USN-5806-3","USN-6181-1"],"upstream":["CVE-2021-33621"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33621"},{"type":"REPORT","url":"https://www.ruby-lang.org/en/news/2022/11/22/http-response-splitting-in-cgi-cve-2021-33621/"},{"type":"REPORT","url":"https://github.com/ruby/cgi/commit/64c5045c0a6b84fdb938a8465a0890e5f7162708"},{"type":"REPORT","url":"https://github.com/ruby/cgi/commit/b46d41c36380e04f6388970b5ef05c687f4d1819"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5806-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5806-2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5806-3"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6181-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-33621"}],"affected":[{"package":{"name":"jruby","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/jruby?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.6-5ubuntu1","1.5.6-6","1.5.6-7","1.5.6-9+deb8u2build0.14.04.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"jruby","binary_version":"1.5.6-9+deb8u2build0.14.04.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33621.json"}},{"package":{"name":"ruby2.3","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/ruby2.3?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.1-2~ubuntu16.04.16+esm4"}]}],"versions":["2.3.0-1","2.3.0-2","2.3.0-4ubuntu2","2.3.0-4ubuntu3","2.3.0-5ubuntu1","2.3.1-2~16.04","2.3.1-2~16.04.2","2.3.1-2~16.04.4","2.3.1-2~16.04.5","2.3.1-2~16.04.6","2.3.1-2~16.04.7","2.3.1-2~16.04.9","2.3.1-2~16.04.10","2.3.1-2~16.04.11","2.3.1-2~16.04.12","2.3.1-2~ubuntu16.04.13","2.3.1-2~ubuntu16.04.14","2.3.1-2~ubuntu16.04.15","2.3.1-2~ubuntu16.04.16","2.3.1-2~ubuntu16.04.16+esm1","2.3.1-2~ubuntu16.04.16+esm2","2.3.1-2~ubuntu16.04.16+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.1-2~ubuntu16.04.16+esm4","binary_name":"libruby2.3"},{"binary_name":"ruby2.3","binary_version":"2.3.1-2~ubuntu16.04.16+esm4"},{"binary_version":"2.3.1-2~ubuntu16.04.16+esm4","binary_name":"ruby2.3-tcltk"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33621.json"}},{"package":{"name":"jruby","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/jruby?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.21-2ubuntu4","1.7.22-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"jruby","binary_version":"1.7.22-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33621.json"}},{"package":{"name":"ruby2.5","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/ruby2.5?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.1-1ubuntu1.13"}]}],"versions":["2.5.0~preview1-1ubuntu2","2.5.0-4ubuntu1","2.5.0-4ubuntu4","2.5.0-5ubuntu1","2.5.0-6ubuntu1","2.5.1-1ubuntu1","2.5.1-1ubuntu1.1","2.5.1-1ubuntu1.2","2.5.1-1ubuntu1.4","2.5.1-1ubuntu1.5","2.5.1-1ubuntu1.6","2.5.1-1ubuntu1.7","2.5.1-1ubuntu1.8","2.5.1-1ubuntu1.9","2.5.1-1ubuntu1.10","2.5.1-1ubuntu1.11","2.5.1-1ubuntu1.12"],"ecosystem_specific":{"binaries":[{"binary_version":"2.5.1-1ubuntu1.13","binary_name":"libruby2.5"},{"binary_version":"2.5.1-1ubuntu1.13","binary_name":"ruby2.5"}],"availability":"No subscription 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