The remote host is missing an update to the system as announced in the referenced advisory.

Update your system with the appropriate patches or software upgrades. http://www.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-empty_acls http://www.squid-cache.org/bugs/show_bug.cgi?id=1166 http://www.vuxml.org/freebsd/a30e5e44-5440-11d9-9e1e-c296ac722cb3.html

The following package is affected: squid CVE-2005-0194 Squid 2.5, when processing the configuration file, parses empty Access Control Lists (ACLs), including proxy_auth ACLs without defined auth schemes, in a way that effectively removes arguments, which could allow remote attackers to bypass intended ACLs if the administrator ignores the parser warnings.