CVE-2026-32073 - Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

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HIGH

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Published Apr 14, 2026

7.0

HIGH

CVSS 3.1

EPSS 0.26%

Description

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

Affected products

Vendor Microsoft Product Windows 10 Version 1607 Default
n/a
- Version
  10.0.14393.0
  Status
  affected
  Constraints
  <10.0.14393.9060
Vendor Microsoft Product Windows 10 Version 1809 Default
n/a
- Version
  10.0.17763.0
  Status
  affected
  Constraints
  <10.0.17763.8644
Vendor Microsoft Product Windows 10 Version 21H2 Default
n/a
- Version
  10.0.19044.0
  Status
  affected
  Constraints
  <10.0.19044.7184
Vendor Microsoft Product Windows 10 Version 22H2 Default
n/a
- Version
  10.0.19045.0
  Status
  affected
  Constraints
  <10.0.19045.7184
Vendor Microsoft Product Windows 11 Version 23H2 Default
n/a
- Version
  10.0.22631.0
  Status
  affected
  Constraints
  <10.0.22631.6936
Vendor Microsoft Product Windows 11 Version 24H2 Default
n/a
- Version
  10.0.26100.0
  Status
  affected
  Constraints
  <10.0.26100.8246
Vendor Microsoft Product Windows 11 Version 25H2 Default
n/a
- Version
  10.0.26200.0
  Status
  affected
  Constraints
  <10.0.26200.8246
Vendor Microsoft Product Windows 11 version 22H3 Default
n/a
- Version
  10.0.22631.0
  Status
  affected
  Constraints
  <10.0.22631.6936
Vendor Microsoft Product Windows 11 version 26H1 Default
n/a
- Version
  10.0.28000.0
  Status
  affected
  Constraints
  <10.0.28000.1836
Vendor Microsoft Product Windows Server 2012 Default
n/a
- Version
  6.2.9200.0
  Status
  affected
  Constraints
  <6.2.9200.26026
Vendor Microsoft Product Windows Server 2012 (Server Core installation) Default
n/a
- Version
  6.2.9200.0
  Status
  affected
  Constraints
  <6.2.9200.26026
Vendor Microsoft Product Windows Server 2012 R2 Default
n/a
- Version
  6.3.9600.0
  Status
  affected
  Constraints
  <6.3.9600.23132
Vendor Microsoft Product Windows Server 2012 R2 (Server Core installation) Default
n/a
- Version
  6.3.9600.0
  Status
  affected
  Constraints
  <6.3.9600.23132
Vendor Microsoft Product Windows Server 2016 Default
n/a
- Version
  10.0.14393.0
  Status
  affected
  Constraints
  <10.0.14393.9060
Vendor Microsoft Product Windows Server 2016 (Server Core installation) Default
n/a
- Version
  10.0.14393.0
  Status
  affected
  Constraints
  <10.0.14393.9060
Vendor Microsoft Product Windows Server 2019 Default
n/a
- Version
  10.0.17763.0
  Status
  affected
  Constraints
  <10.0.17763.8644
Vendor Microsoft Product Windows Server 2019 (Server Core installation) Default
n/a
- Version
  10.0.17763.0
  Status
  affected
  Constraints
  <10.0.17763.8644
Vendor Microsoft Product Windows Server 2022 Default
n/a
- Version
  10.0.20348.0
  Status
  affected
  Constraints
  <10.0.20348.5020
Vendor Microsoft Product Windows Server 2022, 23H2 Edition (Server Core installation) Default
n/a
- Version
  10.0.25398.0
  Status
  affected
  Constraints
  <10.0.25398.2274
Vendor Microsoft Product Windows Server 2025 Default
n/a
- Version
  10.0.26100.0
  Status
  affected
  Constraints
  <10.0.26100.32690
Vendor Microsoft Product Windows Server 2025 (Server Core installation) Default
n/a
- Version
  10.0.26100.0
  Status
  affected
  Constraints
  <10.0.26100.32690

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Microsoft

Windows 10 Version 1607

n/a

Version	Status	Constraints
10.0.14393.0	affected	<10.0.14393.9060

Microsoft

Windows 10 Version 1809

n/a

Version	Status	Constraints
10.0.17763.0	affected	<10.0.17763.8644

Microsoft

Windows 10 Version 21H2

n/a

Version	Status	Constraints
10.0.19044.0	affected	<10.0.19044.7184

Microsoft

Windows 10 Version 22H2

n/a

Version	Status	Constraints
10.0.19045.0	affected	<10.0.19045.7184

Microsoft

Windows 11 Version 23H2

n/a

Version	Status	Constraints
10.0.22631.0	affected	<10.0.22631.6936

Microsoft

Windows 11 Version 24H2

n/a

Version	Status	Constraints
10.0.26100.0	affected	<10.0.26100.8246

Microsoft

Windows 11 Version 25H2

n/a

Version	Status	Constraints
10.0.26200.0	affected	<10.0.26200.8246

Microsoft

Windows 11 version 22H3

n/a

Version	Status	Constraints
10.0.22631.0	affected	<10.0.22631.6936

Microsoft

Windows 11 version 26H1

n/a

Version	Status	Constraints
10.0.28000.0	affected	<10.0.28000.1836

Microsoft

Windows Server 2012

n/a

Version	Status	Constraints
6.2.9200.0	affected	<6.2.9200.26026

Microsoft

Windows Server 2012 (Server Core installation)

n/a

Version	Status	Constraints
6.2.9200.0	affected	<6.2.9200.26026

Microsoft

Windows Server 2012 R2

n/a

Version	Status	Constraints
6.3.9600.0	affected	<6.3.9600.23132

Microsoft

Windows Server 2012 R2 (Server Core installation)

n/a

Version	Status	Constraints
6.3.9600.0	affected	<6.3.9600.23132

Microsoft

Windows Server 2016

n/a

Version	Status	Constraints
10.0.14393.0	affected	<10.0.14393.9060

Microsoft

Windows Server 2016 (Server Core installation)

n/a

Version	Status	Constraints
10.0.14393.0	affected	<10.0.14393.9060

Microsoft

Windows Server 2019

n/a

Version	Status	Constraints
10.0.17763.0	affected	<10.0.17763.8644

Microsoft

Windows Server 2019 (Server Core installation)

n/a

Version	Status	Constraints
10.0.17763.0	affected	<10.0.17763.8644

Microsoft

Windows Server 2022

n/a

Version	Status	Constraints
10.0.20348.0	affected	<10.0.20348.5020

Microsoft

Windows Server 2022, 23H2 Edition (Server Core installation)

n/a

Version	Status	Constraints
10.0.25398.0	affected	<10.0.25398.2274

Microsoft

Windows Server 2025

n/a

Version	Status	Constraints
10.0.26100.0	affected	<10.0.26100.32690

Microsoft

Windows Server 2025 (Server Core installation)

n/a

Version	Status	Constraints
10.0.26100.0	affected	<10.0.26100.32690

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-416

Use After Free

References (2)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-22499
Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32073
vendor-advisorypatchVendor Advisory

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-22499		Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32073		vendor-advisorypatchVendor Advisory