Microsoft antivirus tools many users already have installed will now automatically mitigate a critical Exchange Server vulnerability, the lynchpin of several recent campaigns to breach on-premises servers.
On Thursday evening, Microsoft announced up-to-date Microsoft Defender Antivirus and System Center Endpoint Protection will now mitigate CVE-2021-26855, one of a chain of four vulnerabilities Microsoft observed hackers exploiting in the wild. While all four were patched earlier this month, and the comprehensive solution is to still install all patches patch, hackers' current playbook is to use CVE-2021-26855 to set up the other three. Blocking that one vulnerability snips the first link in the chain.
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