A memory leak in Apache 2.0 through 2.0.44 allows remote attackers to cause a denial of service (memory consumption) via large chunks of linefeed characters, which causes Apache to allocate 80 bytes for each linefeed.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A156
http://www.vupen.com/english/advisories/2009/1233
http://www.redhat.com/support/errata/RHSA-2003-139.html
http://www.kb.cert.org/vuls/id/206537
http://www.idefense.com/advisory/04.08.03.txt
http://secunia.com/advisories/8499
http://secunia.com/advisories/34920
http://marc.info/?l=bugtraq&m=105013378320711&w=2
http://marc.info/?l=bugtraq&m=104994309010974&w=2
http://marc.info/?l=bugtraq&m=104994239010517&w=2
http://marc.info/?l=bugtraq&m=104982175321731&w=2
http://marc.info/?l=bugtraq&m=104931360606484&w=2
http://lists.apple.com/mhonarc/security-announce/msg00028.html