CVE-2025-49733: Win32k Elevation of Privilege Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-08 · updated 2026-06-17
Weakness: CWE-416

Description

Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

Affected products

Microsoft Windows 10: before 10.0.17763.7558 — fixed in 10.0.17763.7558
Microsoft Windows 10: before 10.0.19044.6093 — fixed in 10.0.19044.6093
Microsoft Windows 10: before 10.0.19045.6093 — fixed in 10.0.19045.6093
Microsoft Windows 11: before 10.0.22621.5624 — fixed in 10.0.22621.5624
Microsoft Windows 11: before 10.0.22631.5624 — fixed in 10.0.22631.5624
Microsoft Windows 11: before 10.0.26100.4652 — fixed in 10.0.26100.4652
Microsoft Windows Server 2019: before 10.0.17763.7558 — fixed in 10.0.17763.7558
Microsoft Windows Server 2022: before 10.0.20348.3932 — fixed in 10.0.20348.3932
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1732 — fixed in 10.0.25398.1732
Microsoft Windows Server 2025: before 10.0.26100.4652 — fixed in 10.0.26100.4652
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.7558 — fixed in 10.0.17763.7558
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.6093 — fixed in 10.0.19044.6093
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.6093 — fixed in 10.0.19045.6093
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.5624 — fixed in 10.0.22621.5624
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.5624 — fixed in 10.0.22631.5624
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.5624 — fixed in 10.0.22631.5624
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.4652 — fixed in 10.0.26100.4652
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.7558 — fixed in 10.0.17763.7558
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.3932 — fixed in 10.0.20348.3932
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1732 — fixed in 10.0.25398.1732
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.4652 — fixed in 10.0.26100.4652

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.7558; Microsoft Windows 10 10.0.19044.6093; Microsoft Windows 10 10.0.19045.6093; Microsoft Windows 11 10.0.22621.5624; Microsoft Windows 11 10.0.22631.5624; Microsoft Windows 11 10.0.26100.4652; Microsoft Windows Server 2019 10.0.17763.7558; Microsoft Windows Server 2022 10.0.20348.3932; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1732; Microsoft Windows Server 2025 10.0.26100.4652; Microsoft Windows 10 10.0.17763.7558; Microsoft Windows 10 10.0.19044.6093. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49733

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