The remote host is missing an update to freetype announced via advisory DSA 1784-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201784-1

Tavis Ormandy discovered several integer overflows in FreeType, a library to process and access font files, resulting in heap- or stack-based buffer overflows leading to application crashes or the execution of arbitrary code via a crafted font file. For the oldstable distribution (etch), this problem has been fixed in version 2.2.1-5+etch4. For the stable distribution (lenny), this problem has been fixed in version 2.3.7-2+lenny1. For the testing distribution (squeeze), this problem will be fixed soon. For the unstable distribution (sid), this problem has been fixed in version 2.3.9-4.1. We recommend that you upgrade your freetype packages.