MS.Exchange.Server.CVE-2021-34473.Remote.Code.Execution

Description

This indicates an attack attempt to exploit a Remote Code Execution in Microsoft Exchange Server.
. The vulnerability is due to insufficient sanitization when handling a malicious request. A remote attacker may be able to exploit this to disclose data or execute arbitrary code within the context of the application, via a crafted HTTP request.

Outbreak Alert

Critical zero-day vulnerabilities that can allow the attacker to do a Remote Code Execution (RCE) on Microsoft Exchange Servers. FortiGuard has added multiple protections throughout the Security Fabric to safeguard its customers from attacks exploiting these zero-day vulnerabilities.

View the full Outbreak Alert Report

Joint Cybersecurity Advisory (CSA) has released the top Common Vulnerabilities and Exposures (CVEs) used since 2020 by Peoples Republic of China (PRC) state-sponsored cyber actors as assessed by the National Security Agency (NSA), Cybersecurity and Infrastructure Security Agency (CISA), and Federal Bureau of Investigation (FBI). Previously, FortiGuard labs has already published various Outbreaks Alerts included in the released CISA's advisory such as: Apache Log4j, Hikvision Webserver Vulnerability, Atlassian Confluence OGNL RCE Vulnerability, Microsoft Exchange Server RCE Vulnerabilities etc. See the full list at: https://www.fortiguard.com/outbreak-alert Links to dedicated reports on each published outbreak by FortiGuard Labs are added to Additional Resources section below.

View the full Outbreak Alert Report

The Hive ransomware gang has received up to $100+ million in ransom payments from more than 1,300 victims according to a joint advisory released by the FBI, the U.S. Cybersecurity and Infrastructure Security Agency, and the Department of Health and Human Services.

View the full Outbreak Alert Report

View the full Outbreak Alert Report

Affected Products

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

Impact

System Compromise: Remote attackers can gain control of vulnerable systems.

Recommended Actions

Apply the most recent upgrade or patch from the vendor.
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473

References