Microsoft Exchange zero-day attacks: 30,000 servers hit already, says report

Four previously unknown or ‘zero-day’ vulnerabilities in Microsoft Exchange Server are now being used in widespread attacks against thousands of organisations with potentially tens of thousands of organisations affected, according to security researchers. The bugs are being tracked as CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065.

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