High severity7.8NVD Advisory· Published Jul 5, 2020· Updated Jun 17, 2026
CVE-2020-15530
CVE-2020-15530
Description
An issue was discovered in Valve Steam Client 2.10.91.91. The installer allows local users to gain NT AUTHORITY\SYSTEM privileges because some parts of %PROGRAMFILES(X86)%\Steam and/or %COMMONPROGRAMFILES(X86)%\Steam have weak permissions during a critical time window. An attacker can make this time window arbitrarily long by using opportunistic locks.
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Affected products
3cpe:2.3:a:valvesoftware:steam_client:2.10.91.91:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:valvesoftware:steam_client:2.10.91.91:*:*:*:*:*:*:*
- (no CPE)range: = 2.10.91.91
- Valve/Steam Clientdescription
Patches
Vulnerability mechanics
References
1- daniels-it-blog.blogspot.com/2020/07/steam-arbitrary-code-execution-part-2.htmlnvdExploitThird Party Advisory
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