CVE-2019-17180
Valve Steam Client before 2019-09-12 allows placing or appending partially controlled filesystem content, as demonstrated by file modifications on Windows in the context of NT AUTHORITY\SYSTEM.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.72%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Valve Steam Client before 2019-09-12 allows placing or appending partially controlled filesystem content, as demonstrated by file modifications on Windows in the context of NT AUTHORITY\SYSTEM. This could lead to denial of service, elevation of privilege, or unspecified other impact.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.72% probability · 54th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- valvesoftware/steam client
- Source
- cve@mitre.org
EPSS 0.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://amonitoring.ru/article/steam_vuln_3/Exploit, Third Party Advisory
- https://habr.com/ru/company/pm/blog/469507/Exploit, Third Party Advisory
- https://hackerone.com/reports/583184
- https://hackerone.com/reports/682774Exploit, Third Party Advisory
- https://store.steampowered.com/news/54236/Release Notes, Vendor Advisory
- https://amonitoring.ru/article/steam_vuln_3/Exploit, Third Party Advisory
- https://habr.com/ru/company/pm/blog/469507/Exploit, Third Party Advisory
- https://hackerone.com/reports/583184
- https://hackerone.com/reports/682774Exploit, Third Party Advisory
- https://store.steampowered.com/news/54236/Release Notes, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.