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-header_parsing http://www.vuxml.org/freebsd/b4d94fa0-6e38-11d9-9e1e-c296ac722cb3.html

The following package is affected: squid CVE-2005-0174 Squid 2.5 up to 2.5.STABLE7 allows remote attackers to poison the cache or conduct certain attacks via headers that do not follow the HTTP specification, including (1) multiple Content-Length headers, (2) carriage return (CR) characters that are not part of a CRLF pair, and (3) header names containing whitespace characters.