{"answers":{"affected":"8 open source packages ship an affected version, including cgi, ruby and ruby-min. It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-33621 in the wild and no public exploit code.","fix":"Upgrade cgi to a fixed version for your release line: 0.1.0.2, 0.2.2 or 0.3.5.","what":"CVE-2021-33621 is a high-severity vulnerability in Fedoraproject Fedora, published on 18 Nov 2022. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-33621 and fix it if it is affected.\n\nWhat it is: CVE-2021-33621 is a high-severity vulnerability in Fedoraproject Fedora, published on 18 Nov 2022. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-33621 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- cgi (RubyGems): affected all versions; fixed in 0.1.0.2\n- cgi (RubyGems): affected all versions; fixed in 0.1.0.2\n- cgi (RubyGems): affected from 0.2.0; fixed in 0.2.2\n- cgi (RubyGems): affected from 0.2.0; fixed in 0.2.2\n- cgi (RubyGems): affected from 0.3.0; fixed in 0.3.5\n- cgi (RubyGems): affected from 0.3.0; fixed in 0.3.5\n- ruby (Bitnami): affected from 2.7.0; fixed in 2.7.7, 3.0.5, 3.1.3\n- ruby-min (Bitnami): affected from 2.7.0; fixed in 2.7.7, 3.0.5, 3.1.3\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-33621/ (Markdown: https://insights.sbomify.com/CVE-2021-33621/index.md)","id":"CVE-2021-33621","markdown":"https://insights.sbomify.com/CVE-2021-33621/index.md","name":"CVE-2021-33621","record":{"aliases":["ALPINE-CVE-2021-33621","BIT-ruby-2021-33621","BIT-ruby-min-2021-33621","CLEANSTART-2026-JL84667","DEBIAN-CVE-2021-33621","GHSA-vc47-6rqg-c7f5","JLSEC-2026-1286","MGASA-2022-0454","OESA-2023-1003","RHSA-2024:4542","UBUNTU-CVE-2021-33621","USN-5806-1","USN-5806-2","USN-5806-3","openSUSE-SU-2024:12539-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Ruby CGI gem","requires_auth":"low_privilege","summary":"Attackers can perform HTTP response splitting in Ruby applications using the CGI gem, potentially modifying responses or bypassing security controls.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"fedora","vendor":"fedoraproject"},{"product":"cgi","vendor":"ruby-lang"},{"product":"ruby","vendor":"ruby-lang"}],"cvss":{"score":8.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-74","name":"Improper Neutralization of Special Elements in Output Used by a Downstream Component"}],"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.","ecosystems":["Bitnami","Red Hat:rhel_eus:9.2::appstream","Red Hat:rhel_eus:9.2::crb","RubyGems","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"HTTP response splitting in CGI","id":"CVE-2021-33621","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"fedoraproject:fedora","products":["fedoraproject:fedora","ruby-lang:ruby"],"type":"other","year":"2021"},"n_packages":38,"n_references":7,"next":{"headline":"Other in n/a","id":"CVE-2021-33622"},"packages":[{"ecosystem":"Bitnami","fixed":["2.7.7","3.0.5","3.1.3"],"introduced":["2.7.0","3.0.0","3.1.0"],"last_affected":[],"package":"ruby","purl":"pkg:bitnami/ruby","source":"BIT-ruby-2021-33621"},{"ecosystem":"Bitnami","fixed":["2.7.7","3.0.5","3.1.3"],"introduced":["2.7.0","3.0.0","3.1.0"],"last_affected":[],"package":"ruby-min","purl":"pkg:bitnami/ruby-min","source":"BIT-ruby-min-2021-33621"},{"ecosystem":"RubyGems","fixed":["0.1.0.2"],"introduced":["0"],"last_affected":[],"package":"cgi","purl":null,"source":"GHSA-vc47-6rqg-c7f5"},{"ecosystem":"RubyGems","fixed":["0.1.0.2"],"introduced":["0"],"last_affected":[],"package":"cgi","purl":"pkg:gem/cgi","source":"GHSA-vc47-6rqg-c7f5"},{"ecosystem":"RubyGems","fixed":["0.2.2"],"introduced":["0.2.0"],"last_affected":[],"package":"cgi","purl":null,"source":"GHSA-vc47-6rqg-c7f5"},{"ecosystem":"RubyGems","fixed":["0.2.2"],"introduced":["0.2.0"],"last_affected":[],"package":"cgi","purl":"pkg:gem/cgi","source":"GHSA-vc47-6rqg-c7f5"},{"ecosystem":"RubyGems","fixed":["0.3.5"],"introduced":["0.3.0"],"last_affected":[],"package":"cgi","purl":null,"source":"GHSA-vc47-6rqg-c7f5"},{"ecosystem":"RubyGems","fixed":["0.3.5"],"introduced":["0.3.0"],"last_affected":[],"package":"cgi","purl":"pkg:gem/cgi","source":"GHSA-vc47-6rqg-c7f5"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.0.4-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"ruby","purl":"pkg:rpm/redhat/ruby","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.0.4-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"ruby-debuginfo","purl":"pkg:rpm/redhat/ruby-debuginfo","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.0.4-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"ruby-debugsource","purl":"pkg:rpm/redhat/ruby-debugsource","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.0.4-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"ruby-default-gems","purl":"pkg:rpm/redhat/ruby-default-gems","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.0.4-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"ruby-devel","purl":"pkg:rpm/redhat/ruby-devel","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.0.4-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"ruby-libs","purl":"pkg:rpm/redhat/ruby-libs","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.0.4-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"ruby-libs-debuginfo","purl":"pkg:rpm/redhat/ruby-libs-debuginfo","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.0.0-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-bigdecimal","purl":"pkg:rpm/redhat/rubygem-bigdecimal","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.0.0-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-bigdecimal-debuginfo","purl":"pkg:rpm/redhat/rubygem-bigdecimal-debuginfo","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:2.2.33-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-bundler","purl":"pkg:rpm/redhat/rubygem-bundler","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:0.5.7-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-io-console","purl":"pkg:rpm/redhat/rubygem-io-console","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:0.5.7-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-io-console-debuginfo","purl":"pkg:rpm/redhat/rubygem-io-console-debuginfo","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:1.3.5-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-irb","purl":"pkg:rpm/redhat/rubygem-irb","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:2.5.1-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-json","purl":"pkg:rpm/redhat/rubygem-json","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:2.5.1-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-json-debuginfo","purl":"pkg:rpm/redhat/rubygem-json-debuginfo","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:5.14.2-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-minitest","purl":"pkg:rpm/redhat/rubygem-minitest","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:1.2.0-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-power_assert","purl":"pkg:rpm/redhat/rubygem-power_assert","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.3.2-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-psych","purl":"pkg:rpm/redhat/rubygem-psych","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.3.2-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-psych-debuginfo","purl":"pkg:rpm/redhat/rubygem-psych-debuginfo","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:13.0.3-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-rake","purl":"pkg:rpm/redhat/rubygem-rake","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:1.4.0-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-rbs","purl":"pkg:rpm/redhat/rubygem-rbs","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:6.3.3-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-rdoc","purl":"pkg:rpm/redhat/rubygem-rdoc","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.2.5-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-rexml","purl":"pkg:rpm/redhat/rubygem-rexml","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:0.2.9-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-rss","purl":"pkg:rpm/redhat/rubygem-rss","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.3.7-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-test-unit","purl":"pkg:rpm/redhat/rubygem-test-unit","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:0.15.2-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygem-typeprof","purl":"pkg:rpm/redhat/rubygem-typeprof","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.2.33-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygems","purl":"pkg:rpm/redhat/rubygems","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::appstream","fixed":["0:3.2.33-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"rubygems-devel","purl":"pkg:rpm/redhat/rubygems-devel","source":"RHSA-2024:4542"},{"ecosystem":"Red Hat:rhel_eus:9.2::crb","fixed":["0:3.0.4-161.el9_2.1"],"introduced":["0"],"last_affected":[],"package":"ruby-doc","purl":"pkg:rpm/redhat/ruby-doc","source":"RHSA-2024:4542"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["3.1.3-1.1"],"introduced":["0"],"last_affected":[],"package":"ruby3.1","purl":"pkg:rpm/opensuse/ruby3.1\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2024:12539-1"}],"prev":{"headline":"Denial of service in n/a","id":"CVE-2021-33620"},"products":["n/a"],"published":"2022-11-18","related":[{"cvss_score":9.8,"headline":"PHP-CGI OS Command Injection","id":"CVE-2024-4577","kev_date_added":"2024-06-12","published":"2024-06-09"},{"cvss_score":9.8,"headline":"Grafana Authentication Bypass","id":"CVE-2021-39226","kev_date_added":"2022-08-25","published":"2021-10-05"},{"cvss_score":9.8,"headline":"VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow","id":"CVE-2019-5544","kev_date_added":"2021-11-03","published":"2019-12-06"},{"cvss_score":9.6,"headline":"Google Chromium V8 Type Confusion","id":"CVE-2024-4947","kev_date_added":"2024-05-20","published":"2024-05-15"},{"cvss_score":9.6,"headline":"Google Chromium Visuals Use-After-Free","id":"CVE-2024-4671","kev_date_added":"2024-05-13","published":"2024-05-09"},{"cvss_score":9.6,"headline":"Google Chromium Mojo Insufficient Data Validation","id":"CVE-2022-3075","kev_date_added":"2022-09-08","published":"2022-09-26"},{"cvss_score":9.6,"headline":"Google Chromium Indexed DB API Use-After-Free","id":"CVE-2021-30633","kev_date_added":"2021-11-03","published":"2021-10-08"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2025-11-04","vendors":["n/a"]},"summary":"Attackers can perform HTTP response splitting in Ruby applications using the CGI gem, potentially modifying responses or bypassing security controls.","url":"https://insights.sbomify.com/CVE-2021-33621/"}