{"id":"CVE-2021-3733","details":"There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.","aliases":["BIT-libpython-2021-3733","BIT-python-2021-3733","BIT-python-min-2021-3733","PSF-2022-6"],"modified":"2026-05-06T04:19:41.444565Z","published":"2022-03-10T17:42:59.623Z","related":["ALSA-2021:4160","ALSA-2022:1764","ALSA-2022:1821","SUSE-SU-2021:3477-1","SUSE-SU-2021:3486-1","SUSE-SU-2021:3489-1","SUSE-SU-2021:3524-1","SUSE-SU-2021:4015-1","SUSE-SU-2021:4015-2","SUSE-SU-2021:4104-1","SUSE-SU-2022:1485-1","openSUSE-SU-2021:1418-1","openSUSE-SU-2021:3489-1","openSUSE-SU-2021:4104-1","openSUSE-SU-2024:11202-1","openSUSE-SU-2024:11284-1","openSUSE-SU-2024:11286-1"],"database_specific":{"unresolved_ranges":[{"cpe":"cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"7.0"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:a:python:python:*:*:*:*:*:*:*:*","extracted_events":[{"fixed":"3.6.14"},{"introduced":"3.7.0"},{"fixed":"3.7.11"},{"introduced":"3.8.0"},{"fixed":"3.8.10"},{"introduced":"3.9.0"},{"fixed":"3.9.5"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:a:python:python:3.10.0:-:*:*:*:*:*:*","extracted_events":[{"last_affected":"3.10.0-NA"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.0"}],"source":"CPE_FIELD"},{"extracted_events":[{"last_affected":"8.0"}],"source":"CPE_FIELD","cpe":"cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:*"},{"cpe":"cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.0"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"33"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"34"}],"source":"CPE_FIELD"},{"source":"CPE_FIELD","cpe":"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"35"}]},{"cpe":"cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"36"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.0"}],"source":"CPE_FIELD"},{"extracted_events":[{"last_affected":"8.4"}],"source":"CPE_FIELD","cpe":"cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*"},{"cpe":"cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.0"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.4:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.4"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.0"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.4"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.4"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.4"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.4"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.4"}],"source":"CPE_FIELD"}]},"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20220407-0001/"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1995234"},{"type":"FIX","url":"https://bugs.python.org/issue43075"},{"type":"FIX","url":"https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb"},{"type":"FIX","url":"https://github.com/python/cpython/pull/24391"},{"type":"FIX","url":"https://ubuntu.com/security/CVE-2021-3733"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"7215d1ae25525c92b026166f9d5cac85fb"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-3733.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}