The remote host is missing an update to the system as announced in the referenced advisory.
The following packages are affected: thunderbird mozilla-thunderbird
CVE-2006-0884 The WYSIWYG rendering engine in Mozilla Thunderbird 1.0.7 and earlier allows user-complicit attackers to bypass javascript security settings and obtain sensitive information or cause a crash via an e-mail containing a javascript URI in the SRC attribute of an IFRAME tag, which is executed when the user edits the e-mail.
Solution: Update your system with the appropriate patches or software upgrades.