There is a vulnerability in Sendmail versions 8.12.8 and prior. The address parser performs insufficient bounds checking in certain conditions due to a char to int conversion, making it possible for an attacker to take control of the application. This problem is not related to the recent ISS vulnerability announcement.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/30957/mz.sendmail.txt
Source: https://packetstormsecurity.com/files/30957/mz.sendmail.txt.html