CVE-2024-21410 is a critical vulnerability affecting Microsoft Exchange Server, with a severity score of 9.8. This elevation of privilege vulnerability can be exploited by attackers to gain unauthorized access to affected systems. The issue impacts various configurations of Microsoft Exchange Server, including certain cumulative updates for both Exchange Server 2016 and 2019. It is essential for organizations to apply appropriate mitigations to protect their systems from potential exploitation.

How do I know if I'm affected?

If you're using Microsoft Exchange Server, you might be affected by the vulnerability. The affected versions include Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 13, and Microsoft Exchange Server 2019 Cumulative Update 14. To know if you're affected, look for unauthorized changes or access at a higher privilege level, which could indicate exploitation of this vulnerability. Keep in mind that this issue does not impact Apple products.

What should I do if I'm affected?

If you're affected by the vulnerability, follow these steps. Update your Microsoft Exchange Server to the latest cumulative update. Enable Extended Protection within your organization. Run the Exchange Server Health Checker script to ensure proper configuration. By taking these actions, you can help protect your system from potential exploitation.

Is CVE-2024-21410 in CISA’s Known Exploited Vulnerabilities Catalog?

Yes, it is in CISA's Known Exploited Vulnerabilities Catalog. This Microsoft Exchange Server Privilege Escalation Vulnerability was added to the catalog on February 15, 2024, with a due date of March 7, 2024. The required action is to apply mitigations as per vendor instructions or discontinue the use of the product if mitigations are unavailable. This critical security issue in Microsoft Exchange Server could allow attackers to gain unauthorized access or control over the system, and organizations must take necessary steps to protect their systems.

Weakness enumeration

The weakness enumeration for this vulnerability is categorized as CWE-287, which involves improper authentication in Microsoft Exchange Server that could lead to unauthorized access and privilege escalation. Mitigation strategies include updating the server and enabling Extended Protection for Authentication.

For more details

CVE-2024-21410 is a critical vulnerability affecting Microsoft Exchange Server, and organizations must take necessary steps to protect their systems. For a comprehensive understanding of this vulnerability, including its description, severity, technical details, and known affected software configurations, refer to the NVD page or the resources listed below.

• Microsoft Security Update Guide

• CISA Binding Operational Directive 22-01

• CISA Known Exploited Vulnerabilities Catalog