The remote host is missing an update to heimdal announced via advisory DSA 758-1. A buffer overflow has been discovered in the telnet server from Heimdal, a free implementation of Kerberos 5, that could lead to the execution of arbitrary code. For the old stable distribution (woody) this problem has been fixed in version 0.4e-7.woody.10.

For the stable distribution (sarge) this problem has been fixed in version 0.6.3-10sarge1. For the unstable distribution (sid) this problem has been fixed in version 0.6.3-11. We recommend that you upgrade your heimdal packages. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20758-1