Microsoft Win32K Privilege Escalation Vulnerability

Added to KEV
2023-05-09
Federal due date
2023-05-30
Vendor
Microsoft
Product
Win32k
EPSS
99.0th percentile (score 0.767, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2023-29336

CISA short description

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation up to SYSTEM privileges.

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.