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CVE-2026-68820

KEV: known exploited SSVC: active

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Published
2026-08-11
Last modified
2026-10-21
CNA
microsoft
NVD status
Analyzed
CWE
CWE-416
CVSS v3.1 (listed by NVD)
7.0
HIGH
Scored by microsoft.com (not yet scored by NVD)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0 (listed by NVD)
—
Not scored
CVSS (listed by CVE.org)
7.0
HIGH
Scored by CNA (microsoft) · v3.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EPSS exploit probability
0.3%
Percentile 25.2%
as of 2026-10-24
CISA KEV
Listed
Added 2026-08-11 / due 2026-08-25
Ransomware use: Unknown
SSVC (CISA ADP)
active
Automatable: no / Impact: total

Attack conditions and impact

Derived from the CNA (via NVD) CVSS 3.1 vector
LocalLoginNo interactionConditions Confidentiality HIntegrity HAvailability H
MetricValueMeaning
Attack vector AVLLocal
Attack complexity ACHHigh (conditions required)
Privileges required PRLRegular user
User interaction UINNone
Scope SUUnchanged
Confidentiality CHHigh
Integrity IHHigh
Availability AHHigh
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

NVD

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

CISA KEV entry

Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability — Microsoft / Windows Ancillary Function Driver for WinSock

Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-68820 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-68820

CVSS assessments

ProviderVersionScoreVector
NVD / [email protected] (Secondary)3.17.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA / microsoft3.17.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Affected products and packages

CNA (CVE.org)

VendorProductVersions
MicrosoftWindows 10 Version 1607
affected: 10.0.14393.0 … < 10.0.14393.9418
MicrosoftWindows 10 Version 1809
affected: 10.0.17763.0 … < 10.0.17763.9121
MicrosoftWindows 10 Version 21H2
affected: 10.0.19044.0 … < 10.0.19044.7663
MicrosoftWindows 10 Version 22H2
affected: 10.0.19045.0 … < 10.0.19045.7663
MicrosoftWindows 11 version 23H2
affected: 10.0.22631.0 … < 10.0.22631.7517
MicrosoftWindows 11 Version 23H2
affected: 10.0.22631.0 … < 10.0.22631.7517
MicrosoftWindows 11 Version 24H2
affected: 10.0.26100.0 … < 10.0.26100.9168
MicrosoftWindows 11 Version 25H2
affected: 10.0.26200.0 … < 10.0.26200.9168
MicrosoftWindows 11 version 26H1
affected: 10.0.28000.0 … < 10.0.28000.2704
MicrosoftWindows Server 2012
affected: 6.2.9200.0 … < 6.2.9200.26280
MicrosoftWindows Server 2012 (Server Core installation)
affected: 6.2.9200.0 … < 6.2.9200.26280
MicrosoftWindows Server 2012 R2
affected: 6.3.9600.0 … < 6.3.9600.23338
MicrosoftWindows Server 2012 R2 (Server Core installation)
affected: 6.3.9600.0 … < 6.3.9600.23338
MicrosoftWindows Server 2016
affected: 10.0.14393.0 … < 10.0.14393.9418
MicrosoftWindows Server 2016 (Server Core installation)
affected: 10.0.14393.0 … < 10.0.14393.9418
MicrosoftWindows Server 2019
affected: 10.0.17763.0 … < 10.0.17763.9121
MicrosoftWindows Server 2019 (Server Core installation)
affected: 10.0.17763.0 … < 10.0.17763.9121
MicrosoftWindows Server 2022
affected: 10.0.20348.0 … < 10.0.20348.5499
MicrosoftWindows Server 2025
affected: 10.0.26100.0 … < 10.0.26100.33296
MicrosoftWindows Server 2025 (Server Core installation)
affected: 10.0.26100.0 … < 10.0.26100.33296

NVD CPE (16)

Show CPE list
VendorProductRangeCPE
microsoftwindows_10_1607< 10.0.14393.9418cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
microsoftwindows_10_1607< 10.0.14393.9418cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
microsoftwindows_10_1809< 10.0.17763.9115cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
microsoftwindows_10_1809< 10.0.17763.9115cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
microsoftwindows_10_21h2< 10.0.19044.7663cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
microsoftwindows_10_22h2< 10.0.19045.7663cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
microsoftwindows_11_23h2< 10.0.22631.7517cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
microsoftwindows_11_24h2< 10.0.26100.9106cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
microsoftwindows_11_25h2< 10.0.26200.9106cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
microsoftwindows_11_26h1< 10.0.28000.2704cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:*:*
microsoftwindows_server_2012cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
microsoftwindows_server_2012cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
microsoftwindows_server_2016< 10.0.14393.9418cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
microsoftwindows_server_2019< 10.0.17763.9115cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
microsoftwindows_server_2022< 10.0.20348.5440cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
microsoftwindows_server_2025< 10.0.26100.33222cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

Linux distribution status

Red Hat ↗

No record

Debian ↗

No record

Ubuntu ↗

No record

References (2)