Check Point Advisories

Microsoft Exchange Server Remote Code Execution (CVE-2021-26857; CVE-2021-26858)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-0107
Date Published:	2 Mar 2021
Severity:	High
Last Updated:	Thursday 29 December, 2022
Source:	Microsoft CVE-2021-26857
Industry Reference:	CVE-2021-26857 CVE-2021-26858
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2019 Cumulative Update 8 Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 7 Microsoft Exchange Server 2016 Cumulative Update 18 Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 31
Vulnerability Description	A remote code execution vulnerability exists in Microsoft Exchange. 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 R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Microsoft Exchange Server Remote Code Execution (CVE-2021-26857) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Content Protection Violation.
Attack Information: Microsoft Exchange Server Remote Code Execution (CVE-2021-26857)