Format string vulnerability in the log function in Net::Server 0.87 and earlier, as used in Postfix Greylisting Policy Server (Postgrey) 1.18 and earlier, and possibly other products, allows remote attackers to cause a denial of service (crash) via format string specifiers that are not properly handled before being sent to syslog, as demonstrated using sender addresses to Postgrey.
https://exchange.xforce.ibmcloud.com/vulnerabilities/20108
http://www.securityfocus.com/bid/13193
http://www.mandriva.com/security/advisories?name=MDKSA-2006:131
http://www.gentoo.org/security/en/glsa/glsa-200608-18.xml
http://www.debian.org/security/2006/dsa-1122
http://www.debian.org/security/2006/dsa-1121
http://secunia.com/advisories/21452
http://secunia.com/advisories/21164
http://secunia.com/advisories/21152
http://secunia.com/advisories/21149
http://secunia.com/advisories/14958
http://marc.info/?l=full-disclosure&m=111354538331167&w=2
http://lists.ee.ethz.ch/postgrey/msg00647.html