A Zero-Day Attacks  is a computer threat that tries to exploit computer application vulnerabilities that are unknown to others, not even to the the software developer, and for which no security fix is readily available. But Microsoft and Adobe Systems have announced that a newly released Microsoft toolkit can be used to block zero-day attacks targeting a security flaw in Adobe’s Acrobat and Reader programs

Microsoft confirmed on Tuesday a new flaw affecting version 6 and 7 of its Internet Explorer web browser that could allow remote code execution. The security advisory noted that targeted attacks using the flaw were already in the wild. This information was confirmed by McAfee , reporting that exploitation of the flaw was originating from the domain topix21century dot com over both HTTP and HTTPS