The WCCP message parsing code in Squid 2.5.STABLE7 and earlier allows remote attackers to cause a denial of service (crash) via malformed WCCP messages with source addresses that are spoofed to reference Squid's home router and invalid WCCP_I_SEE_YOU cache numbers.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10269
http://www.trustix.org/errata/2005/0003/
http://www.squid-cache.org/Advisories/SQUID-2005_2.txt
http://www.securityfocus.com/bid/12275
http://www.redhat.com/support/errata/RHSA-2005-061.html
http://www.redhat.com/support/errata/RHSA-2005-060.html
http://www.novell.com/linux/security/advisories/2005_06_squid.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:014
http://www.debian.org/security/2005/dsa-651
http://securitytracker.com/id?1012882
http://security.gentoo.org/glsa/glsa-200501-25.xml
http://secunia.com/advisories/13825
http://fedoranews.org/updates/FEDORA--.shtml
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000923