Microsoft: Update On-Premises Exchange Server Now

guest · Jan 27, 2023

Phil Muncaster UK / EMEA News Reporter, Infosecurity Magazine - January 27, 2023

Microsoft has urged administrators of on-premises Exchange servers to keep them patched and updated, warning that attackers “are not going to go away.”
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The tech giant’s Exchange Team advised in a blog post yesterday that customers install the latest available Cumulative Update (CU) and Security Update (SU) on all servers, and in some cases Exchange Management Tools workstations.

CUs are designed to streamline the patching process by bundling multiple fixes into a single update. SUs are installed on top of these.
Both are cumulative, so organizations only need to install the latest ones.
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At the time of writing, the most recent versions are CU12 for Exchange Server 2019, CU23 for Exchange Server 2016 and CU23 for Exchange Server 2013, and the latest SU is the January 2023 SU.

“Attackers looking to exploit unpatched Exchange servers are not going to go away. There are too many aspects of unpatched on-premises Exchange environments that are valuable to bad actors looking to exfiltrate data or commit other malicious acts,” Microsoft warned.
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Microsoft: Protect Your Exchange Servers

January 26, 2023
We’ve said it before, we’re saying it now, and we’ll keeping saying it: it is critical to keep your Exchange servers updated. This means installing the latest available Cumulative Update (CU) and Security Update (SU) on all your Exchange servers (and in some cases, your Exchange Management Tools workstations), and occasionally performing manual tasks to harden the environment, such as enabling Extended Protection and enabling certificate signing of PowerShell serialization payloads.
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