The remote host is missing an update to tomcat6 announced via advisory DSA 2160-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202160-1

Several vulnerabilities were discovered in the Tomcat Servlet and JSP engine: CVE-2010-3718 It was discovered that the SecurityManager insufficiently restricted the working directory. CVE-2011-0013 It was discovered that the HTML manager interface is affected by cross-site scripting. CVE-2011-0534 It was discovered that NIO connector performs insufficient validation of the HTTP headers, which could lead to denial of service. The oldstable distribution (lenny) is not affected by these issues. For the stable distribution (squeeze), this problem has been fixed in version 6.0.28-9+squeeze1. For the unstable distribution (sid), this problem has been fixed in version 6.0.28-10. We recommend that you upgrade your tomcat6 packages.