CVE-2025-43715 Race condition in Nullsoft Scriptable Install System
Local attackers can escalate privileges to SYSTEM by winning a race condition in the temporary plugins directory during NSIS installation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-43715?
CVE-2025-43715 is a high-severity vulnerability in Nullsoft Scriptable Install System, published on 17 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-754
Which versions are affected by CVE-2025-43715?
How do I fix CVE-2025-43715?
Upgrade to a fixed version.
Is CVE-2025-43715 being exploited?
There is no known exploitation of CVE-2025-43715 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-43715, GHSA-g9m2-7jc6-pmvf, UBUNTU-CVE-2025-43715.