A zero-day vulnerability appeared last Friday (May 19, 2006) in the form of a critical vulnerability in Microsoft Word. According to Symantec it was being actively exploited with a Trojan horse the company calls Trojan.Mdropper.H. Symantec only rates the specific exploit as a level 1 threat, but they have raised their global Threatcon level to 2 due to the risk of serious exploits arriving.

Read more about now: The Word is a Zero Day Vulnerability