Microsoft Exchange Server Multiple Vulnerabilities

Remote code execution vulnerabilities exist in Microsoft Exchange Server through the WebReady Document Viewing feature. These vulnerabilities could allow remote code execution as Local System if a user views a specially crafted file through Outlook Web Access in a browser. An attacker who successfully exploited the vulnerabilities could run code on the affected server, but only as LocalService. The LocalService account has minimum privileges on the local computer and presents anonymous credentials on the network.