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Hackers took advantage of four separate zero-day vulnerabilities to compromise Microsoft Exchange servers' Outlook Web Access (OWA), giving them access to victims' entire servers and networks as well as to emails and calendar invitations, only at first requiring the address of the server, which can be directly targeted or obtained by mass ...

Army Knowledge Online ( AKO) was a web application that provided enterprise information services to the United States Army, joint, and Department of Defense customers. Enterprise services were provided to those customers on both classified and unclassified networks, and included portal, e-mail, directory, discovery, and single sign-on ...

Header of an unclassified Department of State telegram with the "SIPDIS" tag marked in red. The Secret Internet Protocol Router Network (SIPRNet) is "a system of interconnected computer networks used by the U.S. Department of Defense and the U.S. Department of State to transmit classified information (up to and including information classified SECRET) by packet switching over the 'completely ...

Outlook Web Access is a function of Microsoft Exchange Server to allow access from an internet browser, as if it were a webmail service. So, if there is a work or school network, you could use Outlook there, but from home, you would connect to the Outlook Web Access page using your browser.--.

This allowed them to access additional credentials necessary to assume the privileges of any legitimate user of the network, which in turn allowed them to compromise Microsoft Office 365 email accounts. Additionally, a flaw in Microsoft's Outlook Web App may have allowed attackers to bypass multi-factor authentication.