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CVE-2026-68820

Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free

7.0 HIGHActively exploited (CISA KEV)EPSS 0.33%
  1. Published11 Aug 2026
  2. Added to CISA KEV11 Aug 2026
  3. Remediation due25 Aug 2026
Actively exploited (CISA KEV)

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

Added to KEV: 11 Aug 2026Federal remediation due: 25 Aug 2026

Description

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

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityHigh
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 10 1607< 10.0.14393.9418
Microsoft Windows 10 1809< 10.0.17763.9115
Microsoft Windows 10 21h2< 10.0.19044.7663
Microsoft Windows 10 22h2< 10.0.19045.7663
Microsoft Windows 11 23h2< 10.0.22631.7517
Microsoft Windows 11 24h2< 10.0.26100.9106
Microsoft Windows 11 25h2< 10.0.26200.9106
Microsoft Windows 11 26h1< 10.0.28000.2704
Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.9418
Microsoft Windows Server 2019< 10.0.17763.9115
Microsoft Windows Server 2022< 10.0.20348.5440
Microsoft Windows Server 2025< 10.0.26100.33222

Remediation

Fixed in
Microsoft Windows 10 1607≥ 10.0.14393.9418
Microsoft Windows 10 1809≥ 10.0.17763.9115
Microsoft Windows 10 21h2≥ 10.0.19044.7663
Microsoft Windows 10 22h2≥ 10.0.19045.7663
Microsoft Windows 11 23h2≥ 10.0.22631.7517
Microsoft Windows 11 24h2≥ 10.0.26100.9106
Microsoft Windows 11 25h2≥ 10.0.26200.9106
Microsoft Windows 11 26h1≥ 10.0.28000.2704
Microsoft Windows Server 2016≥ 10.0.14393.9418
Microsoft Windows Server 2019≥ 10.0.17763.9115

References

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Frequently asked

Is CVE-2026-68820 being actively exploited?

Yes. CVE-2026-68820 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 11 Aug 2026.

How severe is CVE-2026-68820?

CVE-2026-68820 has a CVSS 3.1 base score of 7.0, rated high. EPSS estimates a 0.33% probability of exploitation.

Which products are affected by CVE-2026-68820?

Affected products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, and 8 more.

How do I fix CVE-2026-68820?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1607 10.0.14393.9418, Microsoft Windows 10 1809 10.0.17763.9115, Microsoft Windows 10 21h2 10.0.19044.7663 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-68820 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.