Zero-day vulnerability in Windows

Buffer overflow

Vulnerability details

Advisory: SB2019091019 - Privilege escalation in Microsoft Windows Winsock

Vulnerable component: Windows

CVE-ID: CVE-2019-1215

CVSSv3 score: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer


The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the ws2ifsl.sys (Winsock). A local user can run a specially crafted application, trigger memory corruption and execute arbitrary code on the target system with elevated privileges.

Note, this vulnerability is being actively exploited in the wild.

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