CVE-2026-21238
CVSS v3
7.8
HIGH
EPSS Score
3.4 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Technical details
- Published
- 2026-02-10
- Last Modified
- 2026-02-11
Frequently asked questions
What is CVE-2026-21238?
Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Is CVE-2026-21238 actively exploited?
Active exploitation of CVE-2026-21238 has not been confirmed. Its EPSS score was 3.4% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-21238?
CVE-2026-21238 has a CVSS v3 base score of 7.8 (HIGH severity).
Is CVE-2026-21238 affecting your environment?
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