The remote host is missing an update to zebra announced via advisory DSA 415-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20415-1

Two vulnerabilities were discovered in zebra, an IP routing daemon: CVE-2003-0795 - a bug in the telnet CLI could allow a remote attacker to cause a zebra process to crash, resulting in a denial of service. CVE-2003-0858 - netlink messages sent by other users (rather than the kernel) would be accepted, leading to a denial of service. For the current stable distribution (woody) this problem has been fixed in version 0.92a-5woody2. The zebra package has been obsoleted in the unstable distribution by GNU Quagga, where this problem was fixed in version 0.96.4x-4. We recommend that you update your zebra package.