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Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability (Microsoft Windows 10 Version 1607)

CVE-2026-21236
HIGH 7.8

At a glance

Source
NVD
EPSS
EPSS 0.45 % · percentile 39 ()
State
PUBLISHED
Published
Updated
Assigner
microsoft
NVD status
Analyzed

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Description

Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Weaknesses (CWE)

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Cmicrosoft
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · secure@microsoft.com (Secondary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Microsoft · Windows 10 Version 1607affected 10.0.14393.0 < 10.0.14393.8868
Microsoft · Windows 10 Version 1809affected 10.0.17763.0 < 10.0.17763.8389
Microsoft · Windows 10 Version 21H2affected 10.0.19044.0 < 10.0.19044.6937
Microsoft · Windows 10 Version 22H2affected 10.0.19045.0 < 10.0.19045.6937
Microsoft · Windows 11 version 22H3affected 10.0.22631.0 < 10.0.22631.6649
Microsoft · Windows 11 Version 23H2affected 10.0.22631.0 < 10.0.22631.6649
Microsoft · Windows 11 Version 24H2affected 10.0.26100.0 < 10.0.26100.7840
Microsoft · Windows 11 Version 25H2affected 10.0.26200.0 < 10.0.26200.7840
Microsoft · Windows 11 version 26H1affected 10.0.28000.0 < 10.0.28000.1575
Microsoft · Windows 11 Version 26H1affected 10.0.28000.0 < 10.0.28000.1575
Microsoft · Windows Server 2012affected 6.2.9200.0 < 6.2.9200.25923
Microsoft · Windows Server 2012 (Server Core installation)affected 6.2.9200.0 < 6.2.9200.25923
Microsoft · Windows Server 2012 R2affected 6.3.9600.0 < 6.3.9600.23022
Microsoft · Windows Server 2012 R2 (Server Core installation)affected 6.3.9600.0 < 6.3.9600.23022
Microsoft · Windows Server 2016affected 10.0.14393.0 < 10.0.14393.8868
Microsoft · Windows Server 2016 (Server Core installation)affected 10.0.14393.0 < 10.0.14393.8868
Microsoft · Windows Server 2019affected 10.0.17763.0 < 10.0.17763.8389
Microsoft · Windows Server 2019 (Server Core installation)affected 10.0.17763.0 < 10.0.17763.8389
Microsoft · Windows Server 2022affected 10.0.20348.0 < 10.0.20348.4773
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)affected 10.0.25398.0 < 10.0.25398.2149

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD