CVE-2026-21241 — Use After Free in Microsoft Windows 11 Version 22h3

CWE-416 — Use After Free5 documents5 sources
Severity
7.0HIGHNVD
EPSS
0.0%
top 92.77%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
11
Microsoft Windows 11 Version 22h3Microsoft Windows 11 Version 23h2Microsoft Windows 11 Version 24h2+8 more
Timeline
PublishedFeb 10

Description

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.0 | Impact: 5.9

Affected Packages11 packages

▶NVDmicrosoft/windows< 10.0.20348.4711+2
▶NVDmicrosoft/windows_11_23h2< 10.0.22631.6649
▶NVDmicrosoft/windows_11_24h2< 10.0.26100.7781
▶NVDmicrosoft/windows_11_25h2< 10.0.26200.7781
▶CVEListV5microsoft/windows_server_202210.0.20348.0 — 10.0.20348.4773

🔴Vulnerability Details

2
CVEList
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability↗2026-02-10
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GHSA
GHSA-3g4j-rmgh-9r5p: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally↗2026-02-10
▶

📋Vendor Advisories

1
Microsoft
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability↗2026-02-10
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🕵️Threat Intelligence

1
Wiz
CVE-2026-21241 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-21241 — Use After Free in Microsoft | cvebase