HIGH
CVE-2019-15316
CWE-367Published: August 21, 2019· Updated: Jun 17, 2026
7.0
CVSS v3.1
Official 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.
Technical Analysis
CVE-2019-15316 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.0.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Vendors & Products
Microsoft1 product(s)
windows
valvesoftware1 product(s)
steam client
Source: NVD CPE · 2 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (8)
→
https://amonitoring.ru/article/onemore_steam_eop_0day/Third Party Advisory
→
https://habr.com/ru/company/pm/blog/464367/Third Party Advisory
→
https://www.youtube.com/watch?v=I93aH86BUaEExploit · Third Party Advisory
→
https://www.youtube.com/watch?v=ZCHrjP0cMewExploit · Third Party Advisory
→
https://amonitoring.ru/article/onemore_steam_eop_0day/Third Party Advisory
→
https://habr.com/ru/company/pm/blog/464367/Third Party Advisory
→
https://www.youtube.com/watch?v=I93aH86BUaEExploit · Third Party Advisory
→
https://www.youtube.com/watch?v=ZCHrjP0cMewExploit · Third Party Advisory
Quick Facts
CVE IDCVE-2019-15316
CVSS Score7.0 / 10
SeverityHIGH
WeaknessCWE-367
CISA KEVNo
Affected2 vendor(s)
PublishedAug 21, 2019
Related CVEs (CWE-367)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-15316 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.