The remote host is missing an update to icedove announced via advisory DSA 1621-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201621-1

Several remote vulnerabilities have been discovered in the Icedove mail client, an unbranded version of the Thunderbird client. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2008-0304 It was discovered that a buffer overflow in MIME decoding can lead to the execution of arbitrary code. CVE-2008-2785 It was discovered that missing boundary checks on a reference counter for CSS objects can lead to the execution of arbitrary code. CVE-2008-2798 Devon Hubbard, Jesse Ruderman and Martijn Wargers discovered crashes in the layout engine, which might allow the execution of arbitrary code. CVE-2008-2799 Igor Bukanov, Jesse Ruderman and Gary Kwong discovered crashes in the Javascript engine, which might allow the execution of arbitrary code. CVE-2008-2802 moz_bug_r_a4 discovered that XUL documements can escalate privileges by accessing the pre-compiled fastload file. CVE-2008-2803 moz_bug_r_a4 discovered that missing input sanitising in the mozIJSSubScriptLoader.loadSubScript() function could lead to the execution of arbitrary code. Iceweasel itself is not affected, but some addons are. CVE-2008-2807 Daniel Glazman discovered that a programming error in the code for parsing .properties files could lead to memory content being exposed to addons, which could lead to information disclosure. CVE-2008-2809 John G. Myers, Frank Benkstein and Nils Toedtmann discovered that alternate names on self-signed certificates were handled insufficiently, which could lead to spoofings secure connections. CVE-2008-2811 Greg McManus discovered discovered a crash in the block reflow code, which might allow the execution of arbitrary code. For the stable distribution (etch), these problems have been fixed in version 1.5.0.13+1.5.0.15b.dfsg1+prepatch080614d-0etch1. Packages for s390 are not yet available and will be provided later. For the unstable distribution (sid), these problems have been fixed in version 2.0.0.16-1. We recommend that you upgrade your icedove package.