FKIE_CVE-2021-3733

Vulnerability from fkie_nvd - Published: 2022-03-10 17:42 - Updated: 2025-11-03 22:15
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
secalert@redhat.comhttps://bugs.python.org/issue43075Exploit, Issue Tracking, Patch, Vendor Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1995234Issue Tracking, Third Party Advisory
secalert@redhat.comhttps://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fbPatch, Third Party Advisory
secalert@redhat.comhttps://github.com/python/cpython/pull/24391Patch, Third Party Advisory
secalert@redhat.comhttps://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
secalert@redhat.comhttps://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
secalert@redhat.comhttps://security.netapp.com/advisory/ntap-20220407-0001/Third Party Advisory
secalert@redhat.comhttps://ubuntu.com/security/CVE-2021-3733Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugs.python.org/issue43075Exploit, Issue Tracking, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1995234Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fbPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/python/cpython/pull/24391Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20220407-0001/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/CVE-2021-3733Patch, Third Party Advisory
Impacted products
Vendor Product Version
python python *
python python *
python python *
python python *
python python 3.10.0
redhat codeready_linux_builder 8.0
redhat codeready_linux_builder_for_ibm_z_systems 8.0
redhat codeready_linux_builder_for_power_little_endian 8.0
redhat enterprise_linux 8.0
redhat enterprise_linux_eus 8.4
redhat enterprise_linux_for_ibm_z_systems 8.0
redhat enterprise_linux_for_ibm_z_systems_eus 8.4
redhat enterprise_linux_for_power_little_endian 8.0
redhat enterprise_linux_for_power_little_endian_eus 8.4
redhat enterprise_linux_server_aus 8.4
redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.4
redhat enterprise_linux_server_tus 8.4
redhat enterprise_linux_server_update_services_for_sap_solutions 8.4
fedoraproject extra_packages_for_enterprise_linux 7.0
fedoraproject fedora 33
fedoraproject fedora 34
fedoraproject fedora 35
fedoraproject fedora 36
netapp management_services_for_element_software_and_netapp_hci -
netapp ontap_select_deploy_administration_utility -
netapp solidfire\,_enterprise_sds_\&_hci_storage_node -
netapp hci_compute_node_firmware -
To clipboard 

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      "value": "There\u0027s a flaw in urllib\u0027s 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."
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  "id": "CVE-2021-3733",
  "lastModified": "2025-11-03T22:15:50.833",
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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.