known ransomware use

Microsoft Win32k Privilege Escalation Vulnerability

Added to KEV
2021-11-03
Federal due date
2022-05-03
Vendor
Microsoft
Product
Win32k
EPSS
94.2th percentile (score 0.129, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Known
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2016-0167

CISA short description

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation via a crafted application

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.