CVE-2025-21220 in Windows
Summary
by MITRE • 01/14/2025
Microsoft Message Queuing Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 06/11/2026
Microsoft Message Queuing MQ is a component that facilitates asynchronous communication between applications by storing and forwarding messages. The vulnerability arises from improper access control mechanisms within the messaging system that allow unauthorized users to access sensitive information through the queue management interface. This issue stems from inadequate validation of user permissions when accessing queue properties and message content, creating a path for information disclosure attacks.
The technical flaw manifests when the system fails to properly authenticate and authorize access to message queues, enabling attackers to retrieve message contents, queue metadata, and other sensitive data without proper credentials. This occurs because the underlying queue management functions do not adequately enforce security boundaries, allowing privilege escalation through manipulation of queue access parameters. The vulnerability is particularly concerning as it can be exploited through both local and remote attack vectors, depending on the system configuration and network exposure.
The operational impact of this information disclosure vulnerability extends beyond simple data leakage to potentially compromise entire application workflows and system integrity. Attackers can exploit this weakness to gain insights into business processes, user communications, and sensitive transactional data flowing through the messaging infrastructure. The disclosed information may include personally identifiable information, financial data, or proprietary business communications that can be leveraged for further attacks. This vulnerability directly aligns with CWE-200 which addresses improper information exposure and can be mapped to ATT&CK technique T1071.004 for application layer protocol usage.
Mitigation strategies should focus on implementing proper access control measures through the Windows security model, including restricting queue access permissions and enforcing least privilege principles. System administrators should configure appropriate user rights assignments and ensure that only authorized personnel have access to sensitive queue operations. Network segmentation and firewall rules can help limit exposure of MQ services to untrusted networks, while regular security audits should verify that queue permissions are properly configured. Additionally, implementing monitoring solutions to detect unusual queue access patterns can help identify potential exploitation attempts. Microsoft recommends applying the latest security patches and updates to address this vulnerability, while organizations should also consider implementing additional logging and alerting mechanisms to detect unauthorized access attempts to messaging queues.