cgiemail allows remote attackers to use cgiemail as a spam proxy via CRLF injection of encoded newline (%0a) characters in parameters such as "required-subject," which can be used to modify the CC, BCC, and other header fields in the generated email message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/9361
http://www.securityfocus.com/bid/5013
http://www.debian.org/security/2004/dsa-437