There is a remotely exploitable vulnerability in Sendmail versions 8.12.9 and below that allows an attacker to overwrite heap and stack structures.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/31660/sendmail8.12.9.txt
Source: https://packetstormsecurity.com/files/31660/sendmail8.12.9.txt.html