The remote host is missing an update to dvipng announced via advisory DSA 2048-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202048-1

Dan Rosenberg discovered that in dvipng, a utility that converts DVI files to PNG graphics, several array index errors allow context-dependent attackers, via a specially crafted DVI file, to cause a denial of service (crash of the application), and possibly arbitrary code execution. For the stable distribution (lenny), this problem has been fixed in version dvipng_1.11-1+lenny1. For the testing distribution (squeeze), this problem has been fixed in version 1.13-1. For the unstable distribution (sid), this problem has been fixed in version 1.13-1. We recommend that you upgrade your dvipng package.