SB2025091250 - Privilege escalation in Nullsoft Scriptable Install System (NSIS)
Published: September 12, 2025
Security Bulletin ID
SB2025091250
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2025-43715)
CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to escalate privileges on the system.
The vulnerability exists due to EW_CREATEDIR does not always set the CreateRestrictedDirectory error flag. A local attacker can win a race condition and gain elevated privileges on the target system.
Remediation
Install update from vendor's website.