KLA12342 Multiple vulnerabilities in Microsoft Exchange Server

Detect date:

11/09/2021

Severity:

High

Description:

Multiple vulnerabilities were found in Microsoft Exchange Server. Malicious users can exploit these vulnerabilities to perform cross-site scripting attack, execute arbitrary code, spoof user interface.

Exploitation:

Public exploits exist for this vulnerability.

Affected products:

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

Solution:

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

Original advisories:

CVE-2021-41349
CVE-2021-42321
CVE-2021-42305

Impacts:

ACE

Related products:

Microsoft Exchange Server

CVE-IDS:

CVE-2021-413496.5High
CVE-2021-423218.8Critical
CVE-2021-423056.5High

KB list:

5007409

Microsoft official advisories: