On January 18, 2018, Microsoft has published KB4074871 which has the title “Exchange Server guidance to protect against speculative execution side-channel vulnerabilities”. As you might guess, Exchange is affected by Meltdown & Spectre – like any other software. Microsoft explains in KB4074871:
Because these are hardware-level attacks that target x64-based and x86-based processor systems, all supported versions of Microsoft Exchange Server are affected by this issue.
Like Citrix, Microsoft does not offer any updates to address this issue, because there is nothing to fix in Microsoft Exchange. Instead of this, Microsoft recommends to run the lates Exchange Server cumulative update and any required security updates. On top, Microsoft recommends to check software before it is deployed into production. If Exchange is running in a VM, Microsoft recommends to follow the instructions offered by the cloud or hypervisor vendor.
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