Format string vulnerability in vsybase.c in vpopmail 5.4.2 and earlier has unknown impact and attack vectors. NOTE: in a followup post, it was observed that the source code used constants that, when compiled, became static format strings. Thus this is not a vulnerability
https://exchange.xforce.ibmcloud.com/vulnerabilities/17017
http://www.securityfocus.com/bid/10962
http://archives.neohapsis.com/archives/bugtraq/2004-08/0286.html
http://archives.neohapsis.com/archives/bugtraq/2004-08/0264.html
http://archives.neohapsis.com/archives/bugtraq/2004-08/0226.html