7

CVE-2026-20831

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Time-of-check time-of-use (toctou) race condition in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Microsoft ≫ Windows 10 1607 HwPlatform x64 Version < 10.0.14393.8783
Microsoft ≫ Windows 10 1607 HwPlatform x86 Version < 10.0.14393.8783
Microsoft ≫ Windows 10 1809 HwPlatform x64 Version < 10.0.17763.8276
Microsoft ≫ Windows 10 1809 HwPlatform x86 Version < 10.0.17763.8276
Microsoft ≫ Windows 10 21h2 Version < 10.0.19044.6809
Microsoft ≫ Windows 10 22h2 Version < 10.0.19045.6809
Microsoft ≫ Windows 11 23h2 Version < 10.0.22631.6491
Microsoft ≫ Windows 11 24h2 Version < 10.0.26100.7623
Microsoft ≫ Windows 11 25h2 Version < 10.0.26200.7623
Microsoft ≫ Windows Server 2008 Version - Update sp2 HwPlatform x64
Microsoft ≫ Windows Server 2008 Version - Update sp2 HwPlatform x86
Microsoft ≫ Windows Server 2008 Version r2 Update sp1 HwPlatform x64
Microsoft ≫ Windows Server 2016 Version < 10.0.14393.8783
Microsoft ≫ Windows Server 2019 Version < 10.0.17763.8276
Microsoft ≫ Windows Server 2022 Version < 10.0.20348.4648
Microsoft ≫ Windows Server 2022 23h2 Version < 10.0.25398.2092
Microsoft ≫ Windows Server 2025 Version < 10.0.26100.32230
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.31% 0.231
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 7 1 5.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Microsoft 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20831
Vendor Advisory