CVE-2016-4979

Name	CVE-2016-4979
Description	The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
apache2 (PTS)	buster	2.4.38-3+deb10u8	fixed
	buster (security)	2.4.38-3+deb10u10	fixed
	bullseye	2.4.56-1~deb11u2	fixed
	bullseye (security)	2.4.56-1~deb11u1	fixed
	bookworm, sid	2.4.57-2	fixed

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

Package	Type	Release	Fixed Version
apache2	source	wheezy	(not affected)
apache2	source	jessie	(not affected)
apache2	source	(unstable)	2.4.23-1

Notes

[jessie] - apache2 <not-affected> (Vulnerable code not present)
[wheezy] - apache2 <not-affected> (Vulnerable code not present)
HTTP/2 support introduced in 2.4.17
Upstream fix: https://svn.apache.org/r1750779