Debian Security Advisory DSA 765-1 – A buffer overflow was discovered 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.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/38922/dsa-765-1.txt
Source: https://packetstormsecurity.com/files/38922/Debian-Linux-Security-Advisory-765-1.html