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CVE-2021-3733

Published: 2 September 2021

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.

Priority

Medium

CVSS 3 base score: 6.5

Status

Package Release Status
python3.10
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

hirsute
Released (3.10.0~b1-3~21.04)
impish Not vulnerable

jammy Not vulnerable

trusty Does not exist

upstream Needs triage

xenial Ignored
(out of standard support)
python3.5
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Needed

upstream Needs triage

xenial
Released (3.5.2-2ubuntu0~16.04.13+esm1)
python3.6
Launchpad, Ubuntu, Debian
bionic
Released (3.6.9-1~18.04ubuntu1.6)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Ignored
(out of standard support)
python3.7
Launchpad, Ubuntu, Debian
bionic
Released (3.7.5-2ubuntu1~18.04.2)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Ignored
(out of standard support)
python3.8
Launchpad, Ubuntu, Debian
bionic
Released (3.8.0-3ubuntu1~18.04.2)
focal
Released (3.8.10-0ubuntu1~20.04)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Ignored
(out of standard support)
python3.9
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (3.9.5-3~20.04.1)
hirsute Not vulnerable

impish Not vulnerable

jammy Does not exist

trusty Does not exist

upstream
Released (3.9.7-1)
xenial Ignored
(out of standard support)