CVE-2026-68820: listed in the CISA KEV catalog

CVE-2026-68820 · CVSS 7.0 HIGH · KEV 2026-08-11 · patch available

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

Is CVE-2026-68820 exploited?

• Listed in the CISA KEV catalog on 2026-08-11.
• Federal remediation due 2026-08-25.
• Past that date by 80 days.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

• Microsoft · Windows 10 Version 1607 · >= 10.0.14393.0, < 10.0.14393.9418
• Microsoft · Windows 10 Version 1809 · >= 10.0.17763.0, < 10.0.17763.9121
• Microsoft · Windows 10 Version 21H2 · >= 10.0.19044.0, < 10.0.19044.7663
• Microsoft · Windows 10 Version 22H2 · >= 10.0.19045.0, < 10.0.19045.7663
• Microsoft · Windows 11 version 23H2 · >= 10.0.22631.0, < 10.0.22631.7517
• Microsoft · Windows 11 Version 24H2 · >= 10.0.26100.0, < 10.0.26100.9168
• Microsoft · Windows 11 Version 25H2 · >= 10.0.26200.0, < 10.0.26200.9168
• Microsoft · Windows 11 version 26H1 · >= 10.0.28000.0, < 10.0.28000.2704
• Microsoft · Windows Server 2012 · >= 6.2.9200.0, < 6.2.9200.26280
• Microsoft · Windows Server 2012 (Server Core installation) · >= 6.2.9200.0, < 6.2.9200.26280
• Microsoft · Windows Server 2012 R2 · >= 6.3.9600.0, < 6.3.9600.23338
• Microsoft · Windows Server 2012 R2 (Server Core installation) · >= 6.3.9600.0, < 6.3.9600.23338
• Microsoft · Windows Server 2016 · >= 10.0.14393.0, < 10.0.14393.9418
• Microsoft · Windows Server 2016 (Server Core installation) · >= 10.0.14393.0, < 10.0.14393.9418
• Microsoft · Windows Server 2019 · >= 10.0.17763.0, < 10.0.17763.9121
• Microsoft · Windows Server 2019 (Server Core installation) · >= 10.0.17763.0, < 10.0.17763.9121
• Microsoft · Windows Server 2022 · >= 10.0.20348.0, < 10.0.20348.5499
• Microsoft · Windows Server 2025 · >= 10.0.26100.0, < 10.0.26100.33296
• Microsoft · Windows Server 2025 (Server Core installation) · >= 10.0.26100.0, < 10.0.26100.33296
• Microsoft · Windows 10 Version 1809 for 32-bit Systems
• Microsoft · Windows 10 Version 1809 for x64-based Systems
• Microsoft · Windows Server 2022 (Server Core installation)
• Microsoft · Windows 10 Version 21H2 for 32-bit Systems
• Microsoft · Windows 10 Version 21H2 for ARM64-based Systems
• Microsoft · Windows 10 Version 21H2 for x64-based Systems
• Microsoft · Windows 11 Version 25H2 for ARM64-based Systems
• Microsoft · Windows 11 Version 25H2 for x64-based Systems
• Microsoft · Windows 11 Version 23H2 for ARM64-based Systems
• Microsoft · Windows 11 Version 23H2 for x64-based Systems
• Microsoft · Windows 11 Version 26H1 for ARM64-based Systems
• Microsoft · Windows 11 version 26H1 for x64-based Systems

Is there a patch?

Yes. Update to one of these or later:

From Microsoft's CVE record · Microsoft advisory

• KB5120238
• KB5120242
• KB5120229
• KB5120249
• KB5120233
• KB5120228
• KB5121003
• KB5120994
• KB5120240
• KB5121000

From Microsoft's Security Update Guide · Microsoft advisory

What PlainSec published about CVE-2026-68820

• CISA orders two-week fix for exploited Windows bug (2026-08-13)
• Adobe and Microsoft ship huge August patch loads (2026-08-12)

Primary sources

• NVD record
• CISA KEV catalog
• Microsoft KB5120238
• Microsoft KB5120242
• Microsoft KB5120229
• Microsoft KB5120249
• Microsoft KB5120233
• Microsoft KB5120228
• Microsoft KB5121003
• Microsoft KB5120994

What this record does not say

• No EPSS score.

KEV and EPSS are re-checked daily. Record last updated 2026-09-24.