In Valve Steam Client for Windows through 2019-08-07, HKLM\SOFTWARE\Wow6432Node\Valve\Steam has explicit "Full control" for the Users group…

published 2019-08-07 7y ago modified 2026-06-17 4mo ago also EUVD-2019-5883

cvss: 6.6; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits: 0; none known

In Valve Steam Client for Windows through 2019-08-07, HKLM\SOFTWARE\Wow6432Node\Valve\Steam has explicit "Full control" for the Users group, which allows local users to gain NT AUTHORITY\SYSTEM access.

Patch / fix

links 2

amonitoring.ru/article/steamclient-0day/ advisory
habr.com/ru/company/pm/blog/462479/ advisory

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Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

amonitoring.ru https://amonitoring.ru/article/steamclient-0day/ referenced PoC, tagged "exploit" by a source, unverified
habr.com https://habr.com/ru/company/pm/blog/462479/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.6	CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

CWE-732 Incorrect Permission Assignment for Critical Resource

References

amonitoring.ru /article/steamclient-0day/
exploit, patch, third-party-advisory
habr.com /ru/company/pm/blog/462479/
exploit, patch, third-party-advisory
github.com /alexanderbittner/steam-privesc/

Sources

CVE List CVE-2019-14743
NVD CVE-2019-14743

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