The remote host is missing an update as announced via advisory SSA:2008-128-02.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2008-128-02

New mozilla-thunderbird packages are available for Slackware 10.2, 11.0, 12.0, 12.1, and -current to fix security issues, including crashes that can corrupt memory, as well as a JavaScript privilege escalation and arbitrary code execution flaw. More details about these issues may be found here: http://www.mozilla.org/projects/security/known-vulnerabilities.html#thunderbird http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1233 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1234 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1235 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1236 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1237