CVE-2020-15530

HighCVSS 7.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-362

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://daniels-it-blog.blogspot.com/2020/07/steam-arbitrary-code-execution-part-2.htmlExploit, Third Party Advisory
http://daniels-it-blog.blogspot.com/2020/07/steam-arbitrary-code-execution-part-2.htmlExploit, Third Party Advisory

Timeline

Published: Jul 5, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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