Format string vulnerability in Evolution 1.4 through 2.3.6.1 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via the calendar entries such as task lists, which are not properly handled when the user selects the Calendars tab.
marc.info/?l=full-disclosure&m=112368237712032&w=2
secunia.com/advisories/16394
secunia.com/advisories/19380
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usn.ubuntu.com/166-1/