Squid 2.5.STABLE10 and earlier, while performing NTLM authentication, does not properly handle certain request sequences, which allows attackers to cause a denial of service (daemon restart).
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11580
https://exchange.xforce.ibmcloud.com/vulnerabilities/24282
http://www.ubuntu.com/usn/usn-192-1/
http://www.securityfocus.com/bid/14977
http://www.redhat.com/support/errata/RHSA-2006-0052.html
http://www.redhat.com/support/errata/RHSA-2006-0045.html
http://www.novell.com/linux/security/advisories/2005_27_sr.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:181
http://www.debian.org/security/2005/dsa-828
http://securitytracker.com/id?1014920
http://secunia.com/advisories/19532
http://secunia.com/advisories/19161
http://secunia.com/advisories/17177
http://secunia.com/advisories/17050
http://secunia.com/advisories/17015