Integer signedness error in GroupWise Internet Agent (GWIA) in Novell GroupWise 8.0 before HP3 allows remote attackers to execute arbitrary code via a negative BYWEEKNO property in a weekly RRULE variable in a VCALENDAR attachment in an e-mail message.
https://labs.idefense.com/verisign/intelligence/2009/vulnerabilities/display.php?id=947
https://bugzilla.novell.com/show_bug.cgi?id=707527
http://www.novell.com/support/viewContent.do?externalId=7009215