Format string vulnerability in the ErrorLog function in cnf.c in Greylisting daemon (GLD) 1.3 and 1.4 allows remote attackers to execute arbitrary code via format string specifiers in data that is passed directly to syslog.
https://exchange.xforce.ibmcloud.com/vulnerabilities/20067
http://securitytracker.com/alerts/2005/Apr/1013678.html
http://security.gentoo.org/glsa/glsa-200504-10.xml