Squid 2.5.STABLE7 and earlier allows remote attackers to cause a denial of service (segmentation fault) by aborting the connection during a (1) PUT or (2) POST request, which causes Squid to access previously freed memory.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11562
https://exchange.xforce.ibmcloud.com/vulnerabilities/19919
http://www1.uk.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-post
http://www.squid-cache.org/bugs/show_bug.cgi?id=1224
http://www.securityfocus.com/bid/13166
http://www.redhat.com/support/errata/RHSA-2005-489.html
http://www.redhat.com/support/errata/RHSA-2005-415.html
http://secunia.com/advisories/12508
http://fedoranews.org/updates/FEDORA--.shtml
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000931