CVE-2025-21343

Summary

CVE-2025-21343 is a newly disclosed vulnerability affecting the Windows Web Threat Defense User Service. This issue results in the unintended disclosure of sensitive information, potentially enabling an attacker to gain insight into the system's security configuration. An attacker could exploit this vulnerability by sending specially crafted HTTP requests to the affected system. Successful exploitation could lead to the leaking of information related to the Web Threat Defense User Service, including its status and other details. Microsoft has released a security update to address this vulnerability, and it is recommended that users install the patch as soon as possible to mitigate the risk.

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