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CVE-2020-15530

HIGH

7.8

CVSS Score

Published: July 5, 2020 at 12:31 AM UTC

Updated: June 17, 2026 at 02:56 AM UTC

1 product affected across 1 vendorSteam Client

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Severity

HIGH7.8

Exploit prediction

EPSS 0.5%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Steam Client · Valvesoftware

95%

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCExploitThird Party Advisory

Source: [email protected]

http://daniels-it-blog.blogspot.com/2020/07/steam-arbitrary-code-execution-part-2.html

CVSS

7.8HIGH[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-362

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