CVE-2026-21241

CVSS v3 7.0 HIGH

7.0^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.0 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

U

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

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21241	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_23h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_server_2022::::::::
	cpe:2.3:o:microsoft:windows_server_2022_23h2::::::::
	cpe:2.3:o:microsoft:windows_server_2025::::::::

History

11 Feb 2026, 20:57

Type	Values Removed	Values Added
First Time		Microsoft windows 11 25h2 Microsoft windows Server 2022 Microsoft windows 11 24h2 Microsoft windows Server 2022 23h2 Microsoft Microsoft windows 11 23h2 Microsoft windows Server 2025
References	~~() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21241 -~~	() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21241 - Vendor Advisory
CPE		cpe:2.3:o:microsoft:windows_11_23h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:* cpe:2.3:o:microsoft:windows_server_2025:::::::: cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:* cpe:2.3:o:microsoft:windows_server_2022:::::::: cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:* cpe:2.3:o:microsoft:windows_server_2022_23h2::::::::

10 Feb 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-02-10 18:16

Updated : 2026-02-11 20:57

NVD link : CVE-2026-21241

Mitre link : CVE-2026-21241

CVE.ORG link : CVE-2026-21241

JSON object : View

Products Affected

CWE

CWE-416

Use After Free

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