The remote host is missing an update to krb4 announced via advisory DSA 731-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20731-1

Several problems have been discovered in telnet clients that could be exploited by malicious daemons the client connects to. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2005-0468 Gaël Delalleau discovered a buffer overflow in the env_opt_add() function that allow a remote attacker to execute arbitrary code. CVE-2005-0469 Gaël Delalleau discovered a buffer overflow in the handling of the LINEMODE suboptions in telnet clients. This can lead to the execution of arbitrary code when connected to a malicious server. For the stable distribution (woody) these problems have been fixed in version 1.1-8-2.4. For the testing distribution (sarge) these problems have been fixed in version 1.2.2-11.2. For the unstable distribution (sid) these problems have been fixed in version 1.2.2-11.2. We recommend that you upgrade your krb4 packages.