KLA11839
Multiple vulnerabilities in Microsoft Exchange Server

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

Below is a complete list of vulnerabilities:

1. A remote code execution vulnerability in Microsoft Malware Protection Engine can be exploited remotely via specially crafted file to execute arbitrary code.
2. A denial of service vulnerability in Microsoft Malware Protection Engine can be exploited remotely via specially crafted file to cause denial of service.

Public exploits exist for this vulnerability.

Malware exists for this vulnerability. Usually such malware is classified as Exploit. More details.

Microsoft Exchange Server 2016
Microsoft Exchange Server 2013

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