CVE-2023-35644: Windows Sysmain Service Elevation of Privilege Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 6.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-12 · updated 2026-06-17
Weakness: CWE-190

Description

Windows Sysmain Service Elevation of Privilege Vulnerability

Affected products

Microsoft Windows 10: before 10.0.17763.5206 — fixed in 10.0.17763.5206
Microsoft Windows 10: before 10.0.19041.3803 — fixed in 10.0.19041.3803
Microsoft Windows 10: before 10.0.19045.3803 — fixed in 10.0.19045.3803
Microsoft Windows 11 21H2: before 10.0.22000.2652 — fixed in 10.0.22000.2652
Microsoft Windows 11: before 10.0.22621.2861 — fixed in 10.0.22621.2861
Microsoft Windows 11: before 10.0.22631.2861 — fixed in 10.0.22631.2861
Microsoft Windows Server 2019: all versions
Microsoft Windows Server 2022: all versions
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.5206 — fixed in 10.0.17763.5206
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19041.3803 — fixed in 10.0.19041.3803
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.3803 — fixed in 10.0.19045.3803
Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.2652 — fixed in 10.0.22000.2652
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.2861 — fixed in 10.0.22621.2861
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22621.2861 — fixed in 10.0.22621.2861
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.2861 — fixed in 10.0.22631.2861
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.5206 — fixed in 10.0.17763.5206
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.2159 — fixed in 10.0.20348.2159
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.584 — fixed in 10.0.25398.584

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.5206; Microsoft Windows 10 10.0.19041.3803; Microsoft Windows 10 10.0.19045.3803; Microsoft Windows 11 21H2 10.0.22000.2652; Microsoft Windows 11 10.0.22621.2861; Microsoft Windows 11 10.0.22631.2861; Microsoft Windows 10 10.0.17763.5206; Microsoft Windows 10 10.0.19041.3803; Microsoft Windows 10 10.0.19045.3803; Microsoft Windows 11 21H2 10.0.22000.2652; Microsoft Windows 11 10.0.22621.2861; Microsoft Windows 11 version 22H3 10.0.22621.2861. Check the vendor advisory for mitigations.

References

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