The handle_headers function in mod_proxy_fcgi.c in the mod_proxy_fcgi module in the Apache HTTP Server 2.4.10 allows remote FastCGI servers to cause a denial of service (buffer over-read and daemon crash) via long response headers.
https://support.apple.com/kb/HT205031
https://support.apple.com/HT205219
https://security.gentoo.org/glsa/201701-36
https://bugzilla.redhat.com/show_bug.cgi?id=1163555
https://access.redhat.com/errata/RHSA-2015:1858
http://www.ubuntu.com/usn/USN-2523-1
http://www.securityfocus.com/bid/71657
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
http://svn.apache.org/viewvc?view=revision&revision=1638818
http://rhn.redhat.com/errata/RHSA-2015-1855.html
http://lists.apple.com/archives/security-announce/2015/Sep/msg00004.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html