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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.

Priority

Medium

CVSS 3 base score: 7.5

Status

Package Release Status
apache2
Launchpad, Ubuntu, Debian
bionic
Released (2.4.29-1ubuntu4.17)
focal
Released (2.4.41-4ubuntu3.5)
hirsute
Released (2.4.46-4ubuntu1.2)
impish
Released (2.4.48-3.1ubuntu2)
jammy
Released (2.4.48-3.1ubuntu2)
trusty Not vulnerable
(code not present)
upstream
Released (2.4.48-4)
xenial Not vulnerable
(http2 disabled in xenial)

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

References

Bugs