KLA12314
Multiple vulnerabilities in Microsoft Exchange Server

Multiple vulnerabilities were found in Microsoft Exchange Server. Malicious users can exploit these vulnerabilities to gain privileges, spoof user interface, execute arbitrary code, cause denial of service.

Below is a complete list of vulnerabilities:

1. An elevation of privilege vulnerability in Microsoft Exchange Server can be exploited remotely to gain privileges.
2. A spoofing vulnerability in Microsoft Exchange Server can be exploited remotely to spoof user interface.
3. A remote code execution vulnerability in Microsoft Exchange Server can be exploited remotely to execute arbitrary code.
4. A denial of service vulnerability in Microsoft Exchange Server can be exploited remotely to cause denial of service.

Microsoft Exchange Server 2013 Cumulative Update 23
Microsoft Exchange Server 2019 Cumulative Update 11
Microsoft Exchange Server 2019 Cumulative Update 10
Microsoft Exchange Server 2016 Cumulative Update 22
Microsoft Exchange Server 2016 Cumulative Update 21

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

CVE-2021-41348
CVE-2021-41350
CVE-2021-26427
CVE-2021-34453

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