Format string vulnerability in util.c in nbsmtp 0.99 and earlier, while running in debug mode, allows remote attackers to execute arbitrary code via format string specifiers that are not properly handled in a syslog call.
https://exchange.xforce.ibmcloud.com/vulnerabilities/21674
http://www.vuxml.org/freebsd/debbb39c-fdb3-11d9-a30d-00b0d09acbfc.html
http://www.securityfocus.com/bid/14441
http://secunia.com/advisories/16324