CVE-2026-68820

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

CVSS 3.1 High 7.0Known exploited (CISA KEV)

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

Description

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

Key data

CVSS 3.1 High 7.0

Score published by microsoft in the CVE record.

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

Attack vector: Local
The attacker needs local access to the system, or to trick a user into running something.
Attack complexity: High
The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required: Low
A basic user account is needed.
User interaction: None
No action from any user is needed.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: High
Serious or total effect on the trustworthiness of data.
Availability impact: High
Serious or total effect on availability.

Metric	Value	What it means
Attack vector	Local	The attacker needs local access to the system, or to trick a user into running something.
Attack complexity	High	The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required	Low	A basic user account is needed.
User interaction	None	No action from any user is needed.
Scope	Unchanged	The impact stays within the vulnerable component.
Confidentiality impact	High	Serious or total effect on the secrecy of data.
Integrity impact	High	Serious or total effect on the trustworthiness of data.
Availability impact	High	Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score: 0.08567 (8.6% probability)
Percentile: 95.1%
Scores of: Nov 10, 2026
Model: v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog: Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
Added to the catalog: Aug 11, 2026
Federal due date: Aug 25, 2026

CISA assessment as of Aug 6, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation: Recorded by CISA as active
Automatable: no
Technical impact: total

Weakness (CWE)

CWE catalog version 5.0.

CWE-416Use After Free

Affected products

Products listed in the CVE record, as the CNA published them.

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

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability (msrc.microsoft.com)vendor-advisorypatch

Timeline

ID reservedJul 31, 2026
Added to CISA KEVAug 11, 2026
Record publishedAug 11, 2026
Record last updatedOct 30, 2026

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:09 UTC. Sources and licenses