CVE-2021-3733
DNSimple urllib AbstractBasicAuthHandler Regular Expression Denial of Service
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.
INFO
Published Date :
March 10, 2022, 5:42 p.m.
Last Modified :
June 30, 2023, 11:15 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.8
Public PoC/Exploit Available at Github
CVE-2021-3733 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-3733
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-3733.
| URL | Resource |
|---|---|
| https://bugs.python.org/issue43075 | Exploit Issue Tracking Patch Vendor Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1995234 | Issue Tracking Third Party Advisory |
| https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb | Patch Third Party Advisory |
| https://github.com/python/cpython/pull/24391 | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html | |
| https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html | |
| https://security.netapp.com/advisory/ntap-20220407-0001/ | Third Party Advisory |
| https://ubuntu.com/security/CVE-2021-3733 | Patch Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
List of RegEx DoS (ReDoS) CVEs and resources
security awesome redos regex dos regex-dos pentesting awesome-list regex-security
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-3733 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-3733 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Jun. 30, 2023
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html [No Types Assigned] -
CVE Modified by [email protected]
May. 24, 2023
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html [No Types Assigned] -
Reanalysis by [email protected]
Oct. 26, 2022
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_server: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:*:*:*:*:*:*:* OR *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 Deprecation Remap by [email protected]
Jun. 14, 2022
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:fedoraproject:fedora_extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:* OR *cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:* -
Modified Analysis by [email protected]
Jun. 01, 2022
Action Type Old Value New Value Changed Reference Type https://security.netapp.com/advisory/ntap-20220407-0001/ No Types Assigned https://security.netapp.com/advisory/ntap-20220407-0001/ Third Party Advisory Changed Reference Type https://ubuntu.com/security/CVE-2021-3733 Third Party Advisory https://ubuntu.com/security/CVE-2021-3733 Patch, Third Party Advisory Changed CPE Configuration OR *cpe:2.3:a:python:python:3.6.0:-:*:*:*:*:*:* *cpe:2.3:a:python:python:3.7.0:-:*:*:*:*:*:* *cpe:2.3:a:python:python:3.8.0:-:*:*:*:*:*:* *cpe:2.3:a:python:python:3.9.0:-:*:*:*:*:*:* *cpe:2.3:a:python:python:3.10.0:-:*:*:*:*:*:* OR *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions up to (excluding) 3.6.14 *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 3.7.0 up to (excluding) 3.7.11 *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 3.8.0 up to (excluding) 3.8.10 *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 3.9.0 up to (excluding) 3.9.5 *cpe:2.3:a:python:python:3.10.0:-:*:*:*:*:*:* Changed CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* OR *cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_server: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:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:a:fedoraproject:fedora_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:*:*:*:*:*:*:* Added CPE Configuration OR *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:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Apr. 08, 2022
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20220407-0001/ [No Types Assigned] -
Initial Analysis by [email protected]
Mar. 14, 2022
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:N/I:N/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://bugs.python.org/issue43075 No Types Assigned https://bugs.python.org/issue43075 Exploit, Issue Tracking, Patch, Vendor Advisory Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1995234 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1995234 Issue Tracking, Third Party Advisory Changed Reference Type https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb No Types Assigned https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb Patch, Third Party Advisory Changed Reference Type https://github.com/python/cpython/pull/24391 No Types Assigned https://github.com/python/cpython/pull/24391 Patch, Third Party Advisory Changed Reference Type https://ubuntu.com/security/CVE-2021-3733 No Types Assigned https://ubuntu.com/security/CVE-2021-3733 Third Party Advisory Added CWE NIST CWE-400 Added CPE Configuration OR *cpe:2.3:a:python:python:3.6.0:-:*:*:*:*:*:* *cpe:2.3:a:python:python:3.7.0:-:*:*:*:*:*:* *cpe:2.3:a:python:python:3.8.0:-:*:*:*:*:*:* *cpe:2.3:a:python:python:3.9.0:-:*:*:*:*:*:* *cpe:2.3:a:python:python:3.10.0:-:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-3733 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-3733
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.34 }} 0.08%
score
0.71479
percentile