Vulnerability Details : CVE-2021-3733
Potential exploit
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.
Vulnerability category: Denial of service
Products affected by CVE-2021-3733
- 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_server_aus:8.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:*
- 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:*:*:*:*:*:*:*
- Redhat » Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions » Version: 8.4cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:*
- 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: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:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:management_services_for_element_software_and_netapp_hci:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:hci_compute_node_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:solidfire\,_enterprise_sds_\&_hci_storage_node:-:*:*:*:*:*:*:*
- cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
- cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
- cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
- cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
- cpe:2.3:a:python:python:3.10.0:-:*:*:*:*:*:*
Threat overview for CVE-2021-3733
Top countries where our scanners detected CVE-2021-3733
Top open port discovered on systems with this issue
80
IPs affected by CVE-2021-3733 557,418
Threat actors abusing to this issue?
Yes
Find out if you* are
affected by CVE-2021-3733!
*Directly or indirectly through your vendors, service providers and 3rd parties.
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attack surface intelligence
from SecurityScorecard.
Exploit prediction scoring system (EPSS) score for CVE-2021-3733
0.44%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 60 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-3733
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.0
|
MEDIUM | AV:N/AC:L/Au:S/C:N/I:N/A:P |
8.0
|
2.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
2.8
|
3.6
|
NIST |
CWE ids for CVE-2021-3733
-
The product does not properly control the allocation and maintenance of a limited resource.Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)
References for CVE-2021-3733
-
https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
[SECURITY] [DLA 3477-1] python3.7 security update
-
https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb
bpo-43075: Fix ReDoS in urllib AbstractBasicAuthHandler (GH-24391) · python/cpython@7215d1a · GitHubPatch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
[SECURITY] [DLA 3432-1] python2.7 security update
-
https://ubuntu.com/security/CVE-2021-3733
CVE-2021-3733 | UbuntuPatch;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1995234
1995234 – (CVE-2021-3733) CVE-2021-3733 python: urllib: Regular expression DoS in AbstractBasicAuthHandlerIssue Tracking;Third Party Advisory
-
https://github.com/python/cpython/pull/24391
bpo-43075: Fix ReDoS in request by yetingli · Pull Request #24391 · python/cpython · GitHubPatch;Third Party Advisory
-
https://bugs.python.org/issue43075
Issue 43075: CVE-2021-3733: ReDoS in urllib.request - Python trackerExploit;Issue Tracking;Patch;Vendor Advisory
-
https://security.netapp.com/advisory/ntap-20220407-0001/
CVE-2021-3733 Python Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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