The remote host is missing an update to ethereal announced via advisory DSA 528-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20528-1

Several denial of service vulnerabilities were discovered in ethereal, a network traffic analyzer. These vulnerabilites are described in the ethereal advisory enpa-sa-00015. Of these, only one (CVE-2004-0635) affects the version of ethereal in Debian woody. This vulnerability could be exploited by a remote attacker to crash ethereal with an invalid SNMP packet. For the current stable distribution (woody), these problems have been fixed in version 0.9.4-1woody8. For the unstable distribution (sid), these problems have been fixed in version 0.10.5-1. We recommend that you update your ethereal package.