The remote host is missing an update to avahi announced via advisory DSA 2086-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202086-1

Several vulnerabilities have been discovered in the Avahi mDNS/DNS-SD daemon. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2009-0758 Rob Leslie discovered a denial of service vulnerability in the code used to reflect unicast mDNS traffic. CVE-2010-2244 Ludwig Nussel discovered a denial of service vulnerability in the processing of malformed DNS packets. For the stable distribution (lenny), this problem has been fixed in version 0.6.23-3lenny2. For the unstable distribution (sid), these problems have been fixed in version 0.6.26-1. We recommend that you upgrade your Avahi packages.