CVE-2021-3733

MediumCVSS 6.5/10Last modified Oct 14, 2026

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

No affected versions have been published.

Timeline

Published: Mar 10, 2022
Last modified: Oct 14, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-373305.4Laravel Booking System Booking Core 2.0 is vulnerable to Cross Site Scripting (XSS). The Avatar upload in the My Profile section could be ex CVE-2021-373315.3Laravel Booking System Booking Core 2.0 is vulnerable to Incorrect Access Control. On the Verifications page, after uploading an ID Card or CVE-2021-373339.8Laravel Booking System Booking Core 2.0 is vulnerable to Session Management. A password change at sandbox.bookingcore.org/user/profile/chang CVE-2021-373349.8Umbraco Forms version 4.0.0 up to and including 8.7.5 and below are vulnerable to a security flaw that could lead to a remote code execution CVE-2021-37348.8yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames CVE-2021-373438.8A path traversal vulnerability exists in Nagios XI below version 5.8.5 AutoDiscovery component and could lead to post authenticated RCE unde CVE-2021-373449.8Nagios XI Switch Wizard before version 2.5.7 is vulnerable to remote code execution through improper neutralisation of special elements used CVE-2021-373457.8Nagios XI before version 5.8.5 is vulnerable to local privilege escalation because xi-sys.cfg is being imported from the var directory for s CVE-2021-373469.8Nagios XI WatchGuard Wizard before version 1.4.8 is vulnerable to remote code execution through Improper neutralisation of special elements CVE-2021-373477.8Nagios XI before version 5.8.5 is vulnerable to local privilege escalation because getprofile.sh does not validate the directory name it rec CVE-2021-373487.5Nagios XI before version 5.8.5 is vulnerable to local file inclusion through improper limitation of a pathname in index.php.CVE-2021-373497.8Nagios XI before version 5.8.5 is vulnerable to local privilege escalation because cleaner.php does not sanitise input read from the databas