CVE-2025-21191

Summary

CVE-2025-21191 is a critical vulnerability affecting Windows Local Security Authority (LSA). This toctou (time-of-check time-of-use) race condition allows an authorized attacker to manipulate system data, leading to privilege escalation. The attacker can exploit this vulnerability to elevate their privileges locally, bypassing security restrictions. Successful exploitation could result in unauthorized access to sensitive information or the ability to install malware. Microsoft has released a patch to address this issue, and it is recommended that users install it as soon as possible to protect against potential attacks.

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