CVE-2021-3737
Python HTTP Client Infinite Loop DoS Vuln
Description
A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.
INFO
Published Date :
March 4, 2022, 7:15 p.m.
Last Modified :
Nov. 7, 2023, 3:38 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-3737 has a 2 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-2021-3737
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-2021-3737.
| URL | Resource |
|---|---|
| https://bugs.python.org/issue44022 | Exploit Issue Tracking Vendor Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1995162 | Issue Tracking Patch Third Party Advisory |
| https://github.com/python/cpython/pull/25916 | Patch Third Party Advisory |
| https://github.com/python/cpython/pull/26503 | 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://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html | Patch Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20220407-0009/ | Third Party Advisory |
| https://ubuntu.com/security/CVE-2021-3737 | Patch Third Party Advisory |
| https://www.oracle.com/security-alerts/cpujul2022.html | 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).
None
TypeScript JavaScript Shell
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-3737 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-3737 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]
Nov. 07, 2023
Action Type Old Value New Value Removed CWE Red Hat, Inc. CWE-400 -
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] -
Modified Analysis by [email protected]
Feb. 02, 2023
Action Type Old Value New Value Changed Reference Type https://www.oracle.com/security-alerts/cpujul2022.html No Types Assigned https://www.oracle.com/security-alerts/cpujul2022.html Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:* *cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:* *cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 25, 2022
Action Type Old Value New Value Added Reference https://www.oracle.com/security-alerts/cpujul2022.html [No Types Assigned] -
Modified Analysis by [email protected]
Jul. 01, 2022
Action Type Old Value New Value Changed Reference Type https://security.netapp.com/advisory/ntap-20220407-0009/ No Types Assigned https://security.netapp.com/advisory/ntap-20220407-0009/ Third Party Advisory Changed CPE Configuration OR *cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* 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:6.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:a:netapp:hci:-:*:*:*:*:*:*:* *cpe:2.3:a:netapp:management_services_for_element_software:-:*:*:*:*:*:*:* *cpe:2.3:a:netapp:netapp_xcp_smb:-:*:*:*:*:*:*:* *cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:* *cpe:2.3:a:netapp:xcp_nfs:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Apr. 08, 2022
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20220407-0009/ [No Types Assigned] -
Initial Analysis by [email protected]
Mar. 15, 2022
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:N/A:C) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://bugs.python.org/issue44022 No Types Assigned https://bugs.python.org/issue44022 Exploit, Issue Tracking, Vendor Advisory Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1995162 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1995162 Issue Tracking, Patch, Third Party Advisory Changed Reference Type https://github.com/python/cpython/pull/25916 No Types Assigned https://github.com/python/cpython/pull/25916 Patch, Third Party Advisory Changed Reference Type https://github.com/python/cpython/pull/26503 No Types Assigned https://github.com/python/cpython/pull/26503 Patch, Third Party Advisory Changed Reference Type https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html No Types Assigned https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html Patch, Third Party Advisory Changed Reference Type https://ubuntu.com/security/CVE-2021-3737 No Types Assigned https://ubuntu.com/security/CVE-2021-3737 Patch, Third Party Advisory Added CWE NIST CWE-400 Added CWE NIST CWE-835 Added CPE Configuration OR *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 3.6.0 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) 3.8.11 *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 3.9.0 up to (excluding) 3.9.6 Added CPE Configuration OR *cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Mar. 10, 2022
Action Type Old Value New Value Added Reference https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-3737 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-2021-3737
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.65 }} 0.09%
score
0.88046
percentile