CRLF injection vulnerability in Drupal 4.5.x before 4.5.8 and 4.6.x before 4.5.8 allows remote attackers to inject headers of outgoing e-mail messages and use Drupal as a spam proxy.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25206
http://www.securityfocus.com/bid/17104
http://www.securityfocus.com/archive/1/427591/100/0/threaded
http://www.debian.org/security/2006/dsa-1007
http://securityreason.com/securityalert/579
http://secunia.com/advisories/19257