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CVE-2020-13950

Published: 10 June 2021

Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service

Notes

AuthorNote
mdeslaur
need to check if bionic is vulnerable as it is older than 2.4.41
included in same backport commit as CVE-2019-17567
looks like it was introduced by:
https://svn.apache.org/viewvc?view=revision&revision=1656259

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
apache2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal
Released (2.4.41-4ubuntu3.3)
trusty Not vulnerable
(code not present)
xenial Not vulnerable
(code not present)
impish
Released (2.4.46-4ubuntu2)
groovy
Released (2.4.46-1ubuntu1.2)
hirsute
Released (2.4.46-4ubuntu1.1)
jammy
Released (2.4.46-4ubuntu2)
upstream
Released (2.4.46-6)
Patches:
upstream: https://svn.apache.org/r1678771
upstream: https://github.com/apache/httpd/commit/8c162db8b65b2193e622b780e8c6516d4265f68b
upstream: https://github.com/apache/httpd/commit/fa22b50457c81465b5079dc44c7f1f1cb7431f5d (2.4 backport)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H