Remote Buffer Overflow in Sendmail
From CERT Advisory CA-2003-07: "There is a vulnerability in sendmail that may allow remote attackers to gain the privileges of the sendmail daemon, typically root."
Impact: "Successful exploitation of this vulnerability may allow an attacker to gain the privileges of the sendmail daemon, typically root. Even vulnerable sendmail servers on the interior of a given network may be at risk since the vulnerability is triggered from the contents of a malicious email message."