Description

Nullsoft Scriptable Install System (NSIS) before 3.11 on Windows allows local users to escalate privileges to SYSTEM during an installation, because the temporary plugins directory is created under %WINDIR%\temp and unprivileged users can place a crafted executable file by winning a race condition. This occurs because EW_CREATEDIR does not always set the CreateRestrictedDirectory error flag.

Classification

CVE ID: CVE-2025-43715

CVSS Base Severity: HIGH

CVSS Base Score: 8.1

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected Products

Vendor: Nullsoft

Product: Nullsoft Scriptable Install System

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.01% (probability of being exploited)

EPSS Percentile: 1.39% (scored less or equal to compared to others)

EPSS Date: 2025-04-18 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-43715
https://sourceforge.net/p/nsis/bugs/1315/
https://nsis.sourceforge.io/Docs/AppendixF.html#v3.11-rl

Timeline