The remote host is missing an update to heimdal announced via advisory DSA 765-1. Gaël Delalleau discovered a buffer overflow in the handling of the LINEMODE suboptions in telnet clients. Heimdal, a free implementation of Kerberos 5, also contains such a client. This can lead to the execution of arbitrary code when connected to a malicious server. For the old stable distribution (woody) this problem has been fixed in version 0.4e-7.woody.11.

For the stable distribution (sarge) this problem has been fixed in version 0.6.3-10. For the unstable distribution (sid) this problem has been fixed in version 0.6.3-10. We recommend that you upgrade your heimdal package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20765-1