Microsoft has released 64 patches addressing security vulnerabilities across its products including 11 flaws that are classed as critical -and six vulnerabilities that are actively being exploited by cyber attackers.  

The security flaws impact Microsoft products including Windows, Microsoft Azure, Microsoft Exchange Server, Microsoft Office and more, some of which have been targeted by malicious hackers for months. 

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Two of the critical updates address security vulnerabilities in Microsoft Exchange Server, which have actively been under attack since September