VUPEN Vulnerability Research Team discovered a critical vulnerability in Novell GroupWise. The vulnerability is caused by a buffer overflow error in the "ICalProcessYearlyRule()" function within the "gwwww1.dll" component when processing a malformed "BYWEEKNO" property in a Calendar, which could be exploited by remote unauthenticated attackers to compromise a vulnerable server via a specially crafted email message. Versions 8.0.2 SP2 Hot Patch 2 and below are affected.
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