CVE-2021-3733
At a glance Severity Not available EPSS EPSS 4.80 % · percentile 92 (2026-10-28) State PUBLISHED Published 2022-03-07 Updated 2026-10-14 Assigner redhat NVD status Modified Description 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.
Scores Version Score Vector Scored by CVSS 3.1 MEDIUM 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H NVD · nvd@nist.gov (Primary) CVSS 2.0 MEDIUM 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P NVD · nvd@nist.gov (Primary)
Weaknesses (CWE)
European references
CERT-FR advisories
Affected configurations (NVD CPE) cpe:2.3:a:python:python:*:*:*:*:*:*:*:* < 3.6.14cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 3.7.0 < 3.7.11cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 3.8.0 < 3.8.10cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 3.9.0 < 3.9.5cpe:2.3:a:python:python:3.10.0:-:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.4:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:*cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*cpe:2.3:a:netapp:management_services_for_element_software_and_netapp_hci:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:solidfire\,_enterprise_sds_\&_hci_storage_node:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:hci_compute_node_firmware:-:*:*:*:*:*:*:*Affected products Product Versions python affected Fixed in python v3.6.14, python v3.7.11, python v3.8.10, python v3.9.5.
References
Sources
