In August 2021, a collection of vulnerabilities dubbed ProxyShell was discovered in Microsoft Exchange. Microsoft identified the vulnerabilities and released security updates and patches, but the group had already gained access to over 30,000 organizations in the United States. In March 2021, a China-based attacker group called Hafnium targeted over 400,000 unpatched on-premises servers by exploiting multiple zero-day vulnerabilities to access email accounts, and then installed malware to gain long-term access. Over the years, Exchange servers have been subject to a slew of vulnerabilities. It’s also one of the most vulnerable components of software in a Microsoft environment - especially if it resides on-premises.Īs an IT administrator, it’s important to understand how Exchange servers can be attacked and how to secure them. Exchange Server is a popular email server application that runs on the Windows Server operating system.
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