CVE-2023-21554 is a critical vulnerability affecting various versions of Microsoft Windows and Windows Server systems. With a severity rating of 9.8, this vulnerability allows for remote code execution, enabling attackers to take control of affected systems. Although not yet publicly disclosed or exploited, the risk of exploitation is considered more likely. To protect your systems, it's essential to apply the necessary security updates and follow recommended mitigation strategies.

How do I know if I'm affected?

To determine if you're affected by this vulnerability, you should check if you're using any of the impacted software configurations. The vulnerability affects various versions of Microsoft Windows 10, Windows 11, and Windows Server. If your system runs any of these versions, it may be at risk. The vulnerability is related to the Microsoft Message Queuing service, and to be exploitable, this service needs to be enabled on your system. You can check if the service is running by looking for the "Message Queuing" service and TCP port 1801 on your computer.

What should I do if I'm affected?

If you're affected by this vulnerability, follow these steps to protect your system: 1) Enable the Windows message queuing service through the Control Panel, 2) Check if the "Message Queuing" service is running, and 3) Verify if TCP port 1801 is listening on your machine. Additionally, apply the security updates provided by Microsoft for your specific Windows version and platform.

Is this in CISA’s Known Exploited Vulnerabilities Catalog?

The CVE-2023-21554 vulnerability is not listed in CISA's Known Exploited Vulnerabilities Catalog. This issue, known as the Microsoft Message Queuing Remote Code Execution Vulnerability, was released on April 11, 2023. It allows attackers to execute remote code by sending a specially crafted malicious packet to a vulnerable server. To mitigate the risk, ensure the Windows message queuing service is enabled and apply the necessary security updates provided by Microsoft.

Weakness enumeration

The weakness enumeration for this vulnerability is "Insufficient Information", indicating a lack of specific details about the vulnerability. It affects Microsoft Message Queuing service and can lead to remote code execution. Mitigations include enabling the service and applying security updates.

For more details

CVE-2023-21554 is a critical vulnerability affecting Microsoft Windows and Windows Server systems. To protect your systems, apply security updates and follow recommended mitigation strategies. For more information about the vulnerability, including its description, severity, technical details, and known affected software configurations, visit the NVD page or the links below.

• NVD - CVE-2023-21554

• Microsoft Security Update Guide