Format string vulnerabilities in the (1) die or (2) log_event functions for ssmtp before 2.50.6 allow remote mail relays to cause a denial of service and possibly execute arbitrary code.
marc.info/?l=bugtraq&m=108403772130855&w=2
secunia.com/advisories/11378
secunia.com/advisories/11384
secunia.com/advisories/11485
secunia.com/advisories/11571
security.gentoo.org/glsa/glsa-200404-18.xml
securitytracker.com/id?1009788
www.debian.org/security/2004/dsa-485
www.osvdb.org/5360
www.osvdb.org/5361
www.securityfocus.com/bid/10150
exchange.xforce.ibmcloud.com/vulnerabilities/15872