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Check Point Advisories

Microsoft Exchange Server Remote Code Execution (CVE-2021-42321)

Check Point Reference: CPAI-2021-0906
Date Published: 23 Nov 2021
Severity: High
Last Updated: 23 Nov 2021
Industry Reference:CVE-2021-42321
Protection Provided by:

Security Gateway
R80, R77, R75

Who is Vulnerable? Microsoft Exchange Server 2016 CU22/2019 CU11
Vulnerability Description A remote code execution vulnerability exists in Microsoft Exchange Server. Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code on the affected system.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Microsoft Exchange Server Remote Code Execution (CVE-2021-42321) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Windows SMB Protection Violation.
Attack Information:  Microsoft Exchange Server Remote Code Execution (CVE-2021-42321)

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