CVE-2021-3733

MEDIUM

6.5

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published3/10/2022

Last Modified11/3/2025

Sourcenvd

Honeypot Sightings0

Affected Products

fedoraproject:extra_packages_for_enterprise_linuxfedoraproject:fedoranetapp:hci_compute_node_firmwarenetapp:management_services_for_element_software_and_netapp_hcinetapp:ontap_select_deploy_administration_utilitynetapp:solidfire\,_enterprise_sds_\&_hci_storage_nodepython:pythonredhat:codeready_linux_builderredhat:codeready_linux_builder_for_ibm_z_systemsredhat:codeready_linux_builder_for_power_little_endianredhat:enterprise_linuxredhat:enterprise_linux_eusredhat:enterprise_linux_for_ibm_z_systemsredhat:enterprise_linux_for_ibm_z_systems_eusredhat:enterprise_linux_for_power_little_endianredhat:enterprise_linux_for_power_little_endian_eusredhat:enterprise_linux_server_ausredhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutionsredhat:enterprise_linux_server_tusredhat:enterprise_linux_server_update_services_for_sap_solutions

Weaknesses (CWE)

CWE-400CWE-400

References

https://bugs.python.org/issue43075(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=1995234(secalert@redhat.com)

https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb(secalert@redhat.com)

https://github.com/python/cpython/pull/24391(secalert@redhat.com)

https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html(secalert@redhat.com)

https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html(secalert@redhat.com)

https://security.netapp.com/advisory/ntap-20220407-0001/(secalert@redhat.com)

https://ubuntu.com/security/CVE-2021-3733(secalert@redhat.com)

https://bugs.python.org/issue43075(af854a3a-2127-422b-91ae-364da2661108)

https://bugzilla.redhat.com/show_bug.cgi?id=1995234(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/python/cpython/pull/24391(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20220407-0001/(af854a3a-2127-422b-91ae-364da2661108)

https://ubuntu.com/security/CVE-2021-3733(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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