CVE-2019-1215Actively exploitedAdded to KEV 2021-11-03Known ransomware campaign use

Microsoft Windows Privilege Escalation Vulnerability

Microsoft, Windows

Description

Microsoft Windows contains an unspecified vulnerability due to the way ws2ifsl.sys (Winsock) handles objects in memory, allowing for privilege escalation. Successful exploitation allows an attacker to execute code with elevated privileges.

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

High

19.3%

estimated chance of real-world exploitation in the next 30 days, higher than 97.3% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2022-05-03

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