The recall_headers function in mod_mem_cache in Apache 2.2.4 does not properly copy all levels of header data, which can cause Apache to return HTTP headers containing previously used data, which could be used by remote attackers to obtain potentially sensitive information.
http://www.vupen.com/english/advisories/2007/2727
http://www.vupen.com/english/advisories/2007/2231
http://www.securityfocus.com/bid/24553
http://www.redhat.com/archives/fedora-package-announce/2007-September/msg00320.html
http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150
http://www.mandriva.com/security/advisories?name=MDKSA-2007:127
http://security.gentoo.org/glsa/glsa-200711-06.xml
http://secunia.com/advisories/27563
http://secunia.com/advisories/26842
http://secunia.com/advisories/26273
http://people.apache.org/~covener/2.2.x-mod_memcache-poolmgmt.diff
http://issues.apache.org/bugzilla/show_bug.cgi?id=41551