Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

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What is CVE-2026-34344?

CVE-2026-34344 is a vulnerability classified as Access of Resource Using Incompatible Type, affecting Windows 10 Version 1607 (affected versions: 10.0.14393.0 – < 10.0.14393.9140), Windows 10 Version 1809 (affected versions: 10.0.17763.0 – < 10.0.17763.8755), Windows 10 Version 21H2 (affected versions: 10.0.19044.0 – < 10.0.19044.7291), and 17 more products. This vulnerability is rated High, with a CVSS score of 7.8. Current sources do not report this vulnerability as exploited.

Overview

Original source data

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Affected products and scope

The analysis could not be completed. The original vulnerability data remains available below.

Technical details

The analysis could not be completed. The original vulnerability data remains available below.

Exploitability

The analysis could not be completed. The original vulnerability data remains available below.

Technical impact

The analysis could not be completed. The original vulnerability data remains available below.

Business impact

The analysis could not be completed. The original vulnerability data remains available below.

Remediation

The analysis could not be completed. The original vulnerability data remains available below.

Detection

The analysis could not be completed. The original vulnerability data remains available below.

Sources (7)

GCVE / Vulnerability-Lookup

microsoft (CNA)

Red Hat CSAF VEX

msrc.microsoft.com

High

Provider: Microsoft
Primary affected product: Windows 10 Version 1607
Affected versions: 10.0.14393.0 – < 10.0.14393.9140
Published: 05/12/2026

Exploitation status: Not exploited
Patch status: Fix available
CISA KEV date: -
CISA KEV due date: -

Estimated exploitation probability (EPSS): 0.00333
Estimated exploitation percentile: 24.08%
Attack capability: Local

Products using this technology (0): -

Classification: CWE-843
Equivalent IDs: GHSA-j4xq-256r-c68q BDU:2026-06734

View details

/GHSA-j4xq-256r-c68q

CVSS3

(CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Attack complexity: Low
Attack vector: Local
Confidentiality impact: High
Integrity impact: High
Privileges required: Low
User interaction required: None

CVSS2

(Not available)

Attack complexity: -
Attack vector: -
Confidentiality impact: -
Integrity impact: -
Privileges required: -
User interaction required: -

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