The remote host is missing an update to php3 announced via advisory DSA 669-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20669-1

Two vulnerabilities have been discovered in php4 which also apply to the version of php3 in the stable Debian distribution. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2004-0594 The memory_limit functionality allows remote attackers to execute arbitrary code under certain circumstances. CVE-2004-0595 The strip_tags function does not filter null (\0) characters within tag names when restricting input to allowed tags, which allows dangerous tags to be processed by some web browsers which could lead to cross-site scripting (XSS) vulnerabilities. For the stable distribution (woody) these problems have been fixed in version 3.0.18-23.1woody2. For the unstable distribution (sid) these problems have been fixed in version 3.0.18-27. We recommend that you upgrade your php3 packages.