The remote host is missing an update to xulrunner announced via advisory DSA 1999-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201999-1

Several remote vulnerabilities have been discovered in Xulrunner, a runtime environment for XUL applications, such as the Iceweasel web browser. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2009-1571 Alin Rad Pop discovered that incorrect memory handling in the HTML parser could lead to the execution of arbitrary code. CVE-2009-3988 Hidetake Jo discovered that the same-origin policy can be bypassed through window.dialogArguments. CVE-2010-0159 Henri Sivonen, Boris Zbarsky, Zack Weinberg, Bob Clary, Martijn Wargers and Paul Nickerson reported crashes in layout engine, which might allow the execution of arbitrary code. CVE-2010-0160 Orlando Barrera II discovered that incorrect memory handling in the implementation of the web worker API could lead to the execution of arbitrary code. CVE-2010-0162 Georgi Guninski discovered that the same origin policy can be bypassed through specially crafted SVG documents. For the stable distribution (lenny), these problems have been fixed in version 1.9.0.18-1. For the unstable distribution (sid), these problems have been fixed in version 1.9.1.8-1. We recommend that you upgrade your xulrunner packages.