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CVE-2021-33193

Published: 16 August 2021

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

Notes

AuthorNote
mdeslaur
commits for trunk and 2.4 don't match, needs investigation
commit for 2.4 is the one listed in the vulnerability report
as of 2021-08-26, no new version of apache contains the fix

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
apache2
Launchpad, Ubuntu, Debian
upstream
Released (2.4.48-4)
xenial Not vulnerable
(http2 disabled in xenial)
trusty Not vulnerable
(code not present)
impish
Released (2.4.48-3.1ubuntu2)
bionic
Released (2.4.29-1ubuntu4.17)
focal
Released (2.4.41-4ubuntu3.5)
hirsute
Released (2.4.46-4ubuntu1.2)
jammy
Released (2.4.48-3.1ubuntu2)
Patches:
upstream: https://github.com/apache/httpd/commit/f990e5ecad40b100a8a5c7c1033c46044a9cb244 (trunk)
upstream: https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c (2.4)

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 High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N