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KLA12169
Multiple vulnerabilities in Microsoft Exchange Server

Updated: 01/25/2024
Detect date
?
05/11/2021
Severity
?
High
Description

Multiple vulnerabilities were found in Microsoft Exchange Server. Malicious users can exploit these vulnerabilities to execute arbitrary code, spoof user interface, bypass security restrictions.

Below is a complete list of vulnerabilities:

  1. A remote code execution vulnerability in Microsoft Exchange Server can be exploited remotely to execute arbitrary code.
  2. A spoofing vulnerability in Microsoft Exchange Server can be exploited remotely to spoof user interface.
  3. A security feature bypass vulnerability in Microsoft Exchange Server can be exploited remotely to bypass security restrictions.
Exploitation

This vulnerability can be exploited by the following malware:

https://threats.kaspersky.com/en/threat/Exploit.Win32.ProxyShell/

Affected products

Microsoft Exchange Server 2016 Cumulative Update 20
Microsoft Exchange Server 2019 Cumulative Update 8
Microsoft Exchange Server 2019 Cumulative Update 9
Microsoft Exchange Server 2013 Cumulative Update 23
Microsoft Exchange Server 2016 Cumulative Update 19

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-2021-31198
CVE-2021-31209
CVE-2021-31207
CVE-2021-31195

Impacts
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ACE 
[?]

SB 
[?]

SUI 
[?]
Related products
Microsoft Exchange Server
CVE-IDS
?
KB list

5003435

Microsoft official advisories
Microsoft Security Update Guide
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