Format string vulnerability in search.c in the imap4d server in GNU Mailutils 0.6 allows remote authenticated users to execute arbitrary code via format string specifiers in the SEARCH command.
http://www.securityfocus.com/bid/14794
http://www.rosiello.org/archivio/imap4d_FreeBSD_exploit.c
http://www.gentoo.org/security/en/glsa/glsa-200509-10.xml
http://www.debian.org/security/2005/dsa-841
http://secunia.com/advisories/17020
http://secunia.com/advisories/16783
http://savannah.gnu.org/patch/index.php?func=detailitem&item_id=4407