The remote host is missing an update to hylafax announced via advisory DSA 401-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20401-1

The SuSE Security Team discovered several exploitable formats string vulnerabilities in hylafax, a flexible client/server fax system, which could lead to executing arbitrary code as root on the fax server. For the stable distribution (woody) this problem has been fixed in version 4.1.1-1.3. For the unstable distribution (sid) this problem has been fixed in version 4.1.8-1. We recommend that you upgrade your hylafax packages.