{"id":"CVE-2020-15530","aliases":["EUVD-2020-7517","GHSA-x228-hc8r-8rjq"],"status":"published","title":"An issue was discovered in Valve Steam Client 2.10.91.91. The installer allows local users to...","description":"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.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00545,"percentile":0.45987,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-269","CWE-362"],"published":"2020-07-05T00:31:24Z","modified":"2026-06-17T02:56:47Z","products":[{"vendor":"valvesoftware","product":"steam_client"}],"references":[{"url":"http://daniels-it-blog.blogspot.com/2020/07/steam-arbitrary-code-execution-part-2.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-15530"},{"url":"https://github.com/advisories/GHSA-x228-hc8r-8rjq"}],"sources":{"cve":[{"id":"CVE-2020-15530","description":"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.","status":"published","published":"2020-07-05T00:31:24Z","modified":"2024-08-04T13:15:20.825Z","updated_at":"2026-11-02T14:35:50.228781Z"}],"euvd":[{"id":"EUVD-2020-7517","description":"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.","status":"published","published":"2020-07-05T00:31:24Z","modified":"2024-08-04T13:15:20Z","updated_at":"2026-11-03T03:07:31.508652Z"}],"ghsa":[{"id":"GHSA-x228-hc8r-8rjq","title":"An issue was discovered in Valve Steam Client 2.10.91.91. The installer allows local users to...","description":"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.","status":"published","published":"2022-05-24T17:22:24Z","modified":"2023-01-29T05:03:17Z","cwes":["CWE-269"],"updated_at":"2026-11-02T14:45:17.130191Z"}],"nvd":[{"id":"CVE-2020-15530","description":"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.","status":"published","published":"2020-07-05T01:15:10.79Z","modified":"2026-06-17T02:56:47.647Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:06:08.145904Z"}]}}