CVE-2025-43715

Summary

CVE-2025-43715 is a vulnerability impacting the Nullsoft Scriptable Install System (NSIS) prior to version 3.11 on Windows. This issue grants local users the ability to elevate privileges to the SYSTEM level during the installation process. The root cause is a race condition in the EW_CREATEDIR function, which fails to consistently set the CreateRestrictedDirectory error flag. Unprivileged users can exploit this vulnerability by placing a crafted executable file in the temporary plugins directory, located under %WINDIR%\\temp, before NSIS creates it. Successful exploitation allows the attacker to escalate privileges and gain full control over the affected system.

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