The remote host is missing an update to iceweasel announced via advisory DSA 2433-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202433-1

Several vulnerabilities have been discovered in Iceweasel, a web browser based on Firefox. The included XULRunner library provides rendering services for several other applications included in Debian. CVE-2012-0455 Soroush Dalili discovered that a cross-site scripting countermeasure related to Javascript URLs could be bypassed. CVE-2012-0456 Atte Kettunen discovered an out of bounds read in the SVG Filters, resulting in memory disclosure. CVE-2012-0458 Mariusz Mlynski discovered that privileges could be escalated through a Javascript URL as the home page. CVE-2012-0461 Bob Clary discovered memory corruption bugs, which may lead to the execution of arbitrary code. For the stable distribution (squeeze), this problem has been fixed in version 3.5.16-13. For the unstable distribution (sid), this problem has been fixed in version 10.0.3esr-1. For the experimental distribution, this problem has been fixed in version 11.0-1. We recommend that you upgrade your iceweasel packages.