CVE-2021-33193

NameCVE-2021-33193
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
apache2 (PTS)stretch2.4.25-3+deb9u9vulnerable
stretch (security)2.4.25-3+deb9u11vulnerable
buster2.4.38-3+deb10u5vulnerable
buster (security)2.4.38-3+deb10u6vulnerable
bullseye2.4.48-3.1+deb11u1fixed
bullseye (security)2.4.51-1~deb11u1fixed
bookworm, sid2.4.51-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
apache2sourcebullseye2.4.48-3.1+deb11u1
apache2source(unstable)2.4.48-4

Notes

[buster] - apache2 <postponed> (Revisit when a suitable backport is available for 2.4.38)
[stretch] - apache2 <postponed> (Revisit when a suitable backport is available for 2.4.25)
https://portswigger.net/research/http2
https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2021-33193

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