What is CVE-2020-15530?

CVE-2020-15530 is a high-severity vulnerability in Valvesoftware Steam Client, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.8/10. Published 2020-07-05.

How severe is CVE-2020-15530?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Valvesoftware Steam Client

CVE-2020-15530

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.

Vulnerability class: Race Condition

EPSS: 0.005 (41.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Valvesoftware Steam_client — versions 2.10.91.91
N/a — versions n/a

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-15530?: CVE-2020-15530 is a high-severity vulnerability in Valvesoftware Steam Client, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.8/10. Published 2020-07-05.
How severe is CVE-2020-15530?: High severity. CVSS v3 base score is 7.8 out of 10.