CVE-2026-68820KEV · OVERDUECWE-416

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

High · published August 11, 2026

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 7.0. It is confirmed in active exploitation. It sits in the 25.1th percentile for exploit probability.

60
days past CISA
deadline
CVSS v3.1
7.0
EPSS
0%
Percentile
25.1
In the wild
Confirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.0 · HIGH
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00332 · 25.1th percentile
Weakness
CWE-416 · Use After Free
Published
2026-08-11T21:19Z
KEV added
2026-08-11 · due 2026-08-25
Affected products (16)
ProductVersionsFixed in
microsoft/windows_10_1607< 10.0.14393.941810.0.14393.9418
microsoft/windows_10_1607< 10.0.14393.941810.0.14393.9418
microsoft/windows_10_1809< 10.0.17763.911510.0.17763.9115
microsoft/windows_10_1809< 10.0.17763.911510.0.17763.9115
microsoft/windows_10_21h2< 10.0.19044.766310.0.19044.7663
microsoft/windows_10_22h2< 10.0.19045.766310.0.19045.7663
microsoft/windows_11_23h2< 10.0.22631.751710.0.22631.7517
microsoft/windows_11_24h2< 10.0.26100.910610.0.26100.9106
microsoft/windows_11_25h2< 10.0.26200.910610.0.26200.9106
microsoft/windows_11_26h1< 10.0.28000.270410.0.28000.2704
microsoft/windows_server_2012all versions—
microsoft/windows_server_2012all versions—
microsoft/windows_server_2016< 10.0.14393.941810.0.14393.9418
microsoft/windows_server_2019< 10.0.17763.911510.0.17763.9115
microsoft/windows_server_2022< 10.0.20348.544010.0.20348.5440
microsoft/windows_server_2025< 10.0.26100.3322210.0.26100.33222
References (2)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68820 · [email protected]https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-68820 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 11 AUG 17:05Z
    Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
    cvelistv5