Detections
Analytics

CVE-2019-15316

high

Description

Valve Steam Client for Windows through 2019-08-20 has weak folder permissions, leading to privilege escalation (to NT AUTHORITY\SYSTEM) via crafted use of CreateMountPoint.exe and SetOpLock.exe to leverage a TOCTOU race condition.

References

https://habr.com/ru/company/pm/blog/464367/

https://amonitoring.ru/article/onemore_steam_eop_0day/

https://www.youtube.com/watch?v=ZCHrjP0cMew

https://www.youtube.com/watch?v=I93aH86BUaE

Details

Source: Mitre, NVD

Published: 2019-08-21

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 6.9

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 7

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00051