The remote host is missing an update to xulrunner announced via advisory DSA 2064-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202064-1

Several remote vulnerabilities have been discovered in Xulrunner, a runtime environment for XUL applications. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2010-0183 wushi discovered that incorrect pointer handling in the frame processing code could lead to the execution of arbitrary code. CVE-2010-1196 Nils discovered that an integer overflow in DOM node parsing could lead to the execution of arbitrary code. CVE-2010-1197 Ilja von Sprundel discovered that incorrect parsing of Content-Disposition headers could lead to cross-site scripting. CVE-2010-1198 Microsoft engineers discovered that incorrect memory handling in the interaction of browser plugins could lead to the execution of arbitrary code. CVE-2010-1199 Martin Barbella discovered that an integer overflow in XSLT node parsing could lead to the execution of arbitrary code. CVE-2010-1200 Olli Pettay, Martijn Wargers, Justin Lebar, Jesse Ruderman, Ben Turner, Jonathan Kew and David Humphrey discovered crashes in the layout engine, which might allow the execution of arbitrary code. CVE-2010-1201 boardraider and stedenon discovered crashes in the layout engine, which might allow the execution of arbitrary code. CVE-2010-1202 Bob Clary, Igor Bukanov, Gary Kwong and Andreas Gal discovered crashes in the Javascript engine, which might allow the execution of arbitrary code. For the stable distribution (lenny), these problems have been fixed in version 1.9.0.19-2. For the unstable distribution (sid), these problems have been fixed in version 1.9.1.10-1 For the experimental distribution, these problems have been fixed in version 1.9.2.4-1. We recommend that you upgrade your xulrunner packages.