The remote host is missing an update as announced via advisory SSA:2004-108-01.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2004-108-01

Upgraded tcpdump packages are available for Slackware 8.1, 9.0, 9.1, and -current to fix denial-of-service issues. Sites using tcpdump should upgrade to the new packages. More details about this issue may be found in the Common Vulnerabilities and Exposures (CVE) database: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0183 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0184 The tcpdump advisory from Rapid7 may be found here: http://www.rapid7.com/advisories/R7-0017.html