{"answers":{"affected":"3 open source packages ship an affected version, including urllib3. It affects 5 products.","exploited":"There is no known exploitation of CVE-2021-33503 in the wild and no public exploit code.","fix":"Upgrade urllib3 to 1.26.5 or later.","what":"CVE-2021-33503 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 29 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-33503 and fix it if it is affected.\n\nWhat it is: CVE-2021-33503 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 29 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-33503 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- urllib3 (PyPI): affected from 1.25.4; fixed in 1.26.5\n- urllib3 (PyPI): affected from 1.25.4; fixed in 1.26.5\n- urllib3 (PyPI): affected from 1.25.4; fixed in 1.26.5\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-2021-33503/ (Markdown: https://insights.sbomify.com/CVE-2021-33503/index.md)","id":"CVE-2021-33503","markdown":"https://insights.sbomify.com/CVE-2021-33503/index.md","name":"CVE-2021-33503","record":{"aliases":["AZL-6821","DEBIAN-CVE-2021-33503","GHSA-q2q7-5pp4-w6pg","MINI-r83f-v2rq-2cj6","OESA-2021-1260","PYSEC-2021-108","RHSA-2021:3473","ROOT-APP-PYPI-CVE-2021-33503","SUSE-RU-2021:2194-1","SUSE-SU-2021:2012-1","SUSE-SU-2021:2195-1","UBUNTU-CVE-2021-33503","USN-5812-1","openSUSE-SU-2021:2012-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python HTTP library","requires_auth":"none","summary":"Attackers can cause denial of service in urllib3 by providing URLs with many @ characters, triggering catastrophic backtracking in the authority parser.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"fedora","vendor":"fedoraproject"},{"product":"enterprise_manager_ops_center","vendor":"oracle"},{"product":"instantis_enterprisetrack","vendor":"oracle"},{"product":"zfs_storage_appliance_kit","vendor":"oracle"},{"product":"urllib3","vendor":"python"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.","ecosystems":["PyPI","Red Hat:ansible_automation_platform:4.2::el7","Red Hat:ansible_automation_platform:4.2::el8","SUSE:HPE Helion OpenStack 8","SUSE:Linux Enterprise High Availability Extension 12 SP3","SUSE:Linux Enterprise High Availability Extension 12 SP4","SUSE:Linux Enterprise High Availability Extension 12 SP5","SUSE:Linux Enterprise Module for Basesystem 15 SP3","SUSE:Linux Enterprise Module for Public Cloud 12","SUSE:Linux Enterprise Module for Web and Scripting 12","SUSE:Linux Enterprise Server 12 SP2-BCL","SUSE:Linux Enterprise Server 12 SP3-BCL","SUSE:Linux Enterprise Server 12 SP3-LTSS","SUSE:Linux Enterprise Server 12 SP4-LTSS","SUSE:Linux Enterprise Server 12 SP5","SUSE:Linux Enterprise Server for SAP Applications 12 SP3","SUSE:Linux Enterprise Server for SAP Applications 12 SP4","SUSE:Linux Enterprise Server for SAP Applications 12 SP5","SUSE:Linux Enterprise Software Development Kit 12 SP5","SUSE:Linux Enterprise Workstation Extension 12 SP5","SUSE:OpenStack Cloud 7","SUSE:OpenStack Cloud 8","SUSE:OpenStack Cloud 9","SUSE:OpenStack Cloud Crowbar 8","SUSE:OpenStack Cloud Crowbar 9","openSUSE:Leap 15.3"],"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":"Catastrophic backtracking in URL authority parser when passed URL containing many @ characters","id":"CVE-2021-33503","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":"fedoraproject:fedora","products":["fedoraproject:fedora","oracle:enterprise_manager_ops_center","oracle:instantis_enterprisetrack","oracle:zfs_storage_appliance_kit"],"type":"denial_of_service","year":"2021"},"n_packages":364,"n_references":6,"next":{"headline":"Missing authorization in n/a","id":"CVE-2021-33504"},"packages":[{"ecosystem":"PyPI","fixed":["1.26.5"],"introduced":["1.25.4"],"last_affected":[],"package":"urllib3","purl":null,"source":"GHSA-q2q7-5pp4-w6pg"},{"ecosystem":"PyPI","fixed":["1.26.5"],"introduced":["1.25.4"],"last_affected":[],"package":"urllib3","purl":"pkg:pypi/urllib3","source":"GHSA-q2q7-5pp4-w6pg"},{"ecosystem":"PyPI","fixed":["1.26.5"],"introduced":["1.25.4"],"last_affected":[],"package":"urllib3","purl":"pkg:pypi/urllib3","source":"PYSEC-2021-108"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:4.2.6-1.el7pc"],"introduced":["0"],"last_affected":[],"package":"automation-hub","purl":"pkg:rpm/redhat/automation-hub","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:4.2.6-1.el7pc"],"introduced":["0"],"last_affected":[],"package":"python-galaxy-ng","purl":"pkg:rpm/redhat/python-galaxy-ng","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:1.26.5-1.el7pc"],"introduced":["0"],"last_affected":[],"package":"python-urllib3","purl":"pkg:rpm/redhat/python-urllib3","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:3.0.4-3.el7pc"],"introduced":["0"],"last_affected":[],"package":"python3-chardet","purl":"pkg:rpm/redhat/python3-chardet","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:7.1.2-3.el7pc"],"introduced":["0"],"last_affected":[],"package":"python3-click","purl":"pkg:rpm/redhat/python3-click","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:4.2.6-1.el7pc"],"introduced":["0"],"last_affected":[],"package":"python3-galaxy-ng","purl":"pkg:rpm/redhat/python3-galaxy-ng","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:0.4.6-3.el7pc"],"introduced":["0"],"last_affected":[],"package":"python3-gnupg","purl":"pkg:rpm/redhat/python3-gnupg","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:2.11.2-3.el7pc"],"introduced":["0"],"last_affected":[],"package":"python3-jinja2","purl":"pkg:rpm/redhat/python3-jinja2","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:1.1.1-4.el7pc"],"introduced":["0"],"last_affected":[],"package":"python3-markupsafe","purl":"pkg:rpm/redhat/python3-markupsafe","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:1.1.1-4.el7pc"],"introduced":["0"],"last_affected":[],"package":"python3-markupsafe-debuginfo","purl":"pkg:rpm/redhat/python3-markupsafe-debuginfo","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:2.8.5-3.el7pc"],"introduced":["0"],"last_affected":[],"package":"python3-semantic-version","purl":"pkg:rpm/redhat/python3-semantic-version","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el7","fixed":["0:1.26.5-1.el7pc"],"introduced":["0"],"last_affected":[],"package":"python3-urllib3","purl":"pkg:rpm/redhat/python3-urllib3","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:4.2.6-1.el8pc"],"introduced":["0"],"last_affected":[],"package":"automation-hub","purl":"pkg:rpm/redhat/automation-hub","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:4.2.6-1.el8pc"],"introduced":["0"],"last_affected":[],"package":"python-galaxy-ng","purl":"pkg:rpm/redhat/python-galaxy-ng","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:1.26.5-1.el8pc"],"introduced":["0"],"last_affected":[],"package":"python-urllib3","purl":"pkg:rpm/redhat/python-urllib3","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:7.1.2-3.el8pc"],"introduced":["0"],"last_affected":[],"package":"python3-click","purl":"pkg:rpm/redhat/python3-click","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:4.2.6-1.el8pc"],"introduced":["0"],"last_affected":[],"package":"python3-galaxy-ng","purl":"pkg:rpm/redhat/python3-galaxy-ng","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:0.4.6-3.el8pc"],"introduced":["0"],"last_affected":[],"package":"python3-gnupg","purl":"pkg:rpm/redhat/python3-gnupg","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:2.11.2-3.el8pc"],"introduced":["0"],"last_affected":[],"package":"python3-jinja2","purl":"pkg:rpm/redhat/python3-jinja2","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:1.1.1-4.el8pc"],"introduced":["0"],"last_affected":[],"package":"python3-markupsafe","purl":"pkg:rpm/redhat/python3-markupsafe","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:1.1.1-4.el8pc"],"introduced":["0"],"last_affected":[],"package":"python3-markupsafe-debuginfo","purl":"pkg:rpm/redhat/python3-markupsafe-debuginfo","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:1.1.1-4.el8pc"],"introduced":["0"],"last_affected":[],"package":"python3-markupsafe-debugsource","purl":"pkg:rpm/redhat/python3-markupsafe-debugsource","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:2.8.5-3.el8pc"],"introduced":["0"],"last_affected":[],"package":"python3-semantic-version","purl":"pkg:rpm/redhat/python3-semantic-version","source":"RHSA-2021:3473"},{"ecosystem":"Red Hat:ansible_automation_platform:4.2::el8","fixed":["0:1.26.5-1.el8pc"],"introduced":["0"],"last_affected":[],"package":"python3-urllib3","purl":"pkg:rpm/redhat/python3-urllib3","source":"RHSA-2021:3473"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["1.19.9-22.24.2"],"introduced":["0"],"last_affected":[],"package":"aws-cli","purl":"pkg:rpm/suse/aws-cli\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["5.3.1-28.4.3"],"introduced":["0"],"last_affected":[],"package":"python-PyYAML","purl":"pkg:rpm/suse/python-PyYAML\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["1.20.9-28.30.2"],"introduced":["0"],"last_affected":[],"package":"python-botocore","purl":"pkg:rpm/suse/python-botocore\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["0.4.4-4.4.2"],"introduced":["0"],"last_affected":[],"package":"python-colorama","purl":"pkg:rpm/suse/python-colorama\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["4.3.1-3.9.2"],"introduced":["0"],"last_affected":[],"package":"python-pexpect","purl":"pkg:rpm/suse/python-pexpect\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["0.5.2-2.8.2"],"introduced":["0"],"last_affected":[],"package":"python-ptyprocess","purl":"pkg:rpm/suse/python-ptyprocess\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["2.24.0-3.3.1"],"introduced":["0"],"last_affected":[],"package":"python-requests","purl":"pkg:rpm/suse/python-requests\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-SU-2021:2195-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["1.14.0-13.10.3"],"introduced":["0"],"last_affected":[],"package":"python-six","purl":"pkg:rpm/suse/python-six\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["1.25.10-3.29.1"],"introduced":["0"],"last_affected":[],"package":"python-urllib3","purl":"pkg:rpm/suse/python-urllib3\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["1.25.10-5.19.1"],"introduced":["0"],"last_affected":[],"package":"python-urllib3","purl":"pkg:rpm/suse/python-urllib3\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-SU-2021:2195-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["2.24.0-8.14.3"],"introduced":["0"],"last_affected":[],"package":"python3-requests","purl":"pkg:rpm/suse/python3-requests\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:Linux Enterprise High Availability Extension 12 SP3","fixed":["4.3.1-3.9.2"],"introduced":["0"],"last_affected":[],"package":"python-pexpect","purl":"pkg:rpm/suse/python-pexpect\u0026distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2012%20SP3","source":"SUSE-RU-2021:2194-1"},{"ecosystem":"SUSE:Linux Enterprise High Availability Extension 12 SP3","fixed":["0.5.2-2.8.2"],"introduced":["0"],"last_affected":[],"package":"python-ptyprocess","purl":"pkg:rpm/suse/python-ptyprocess\u0026distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2012%20SP3","source":"SUSE-RU-2021:2194-1"}],"prev":{"headline":"ReDoS in normalize-url","id":"CVE-2021-33502"},"products":["n/a"],"published":"2021-06-29","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":"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":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"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":"2024-08-03","vendors":["n/a"]},"summary":"Attackers can cause denial of service in urllib3 by providing URLs with many @ characters, triggering catastrophic backtracking in the authority parser.","url":"https://insights.sbomify.com/CVE-2021-33503/"}