Up to 97,000 Microsoft Exchange servers may be vulnerable to a critical severity privilege escalation flaw tracked as CVE-2024–21410 that hackers are actively exploiting.
Microsoft addressed the issue on February 13, when it had already been leveraged as a zero-day. Currently, 28,500 servers have been identified as being vulnerable.
Exchange Server is widely used in business environments to facilitate communication and collaboration among users, providing email, calendar, contact management, and task management services.
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