The remote host is missing an update to link-grammar announced via advisory DSA 1432-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201432-1

Alin Rad Pop discovered that link-grammar, Carnegie Mellon University's link grammar parser for English, performed insufficient validation within its tokenizer, which could allow a malicious input file to execute arbitrary code. For the stable distribution (etch), this problem has been fixed in version 4.2.2-4etch1. For the old stable distribution (sarge), this package was not present. For the unstable distribution (sid), this problem was fixed in version 4.2.5-1. We recommend that you upgrade your link-grammar package.