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CVE-2025-30400

High CVSS 7.8 Known exploited

Published 2025-05-13 · last changed 2026-06-17 · added to CISA KEV 2025-05-13

This one is being exploited in the wild.

CISA added CVE-2025-30400 to the Known Exploited Vulnerabilities catalog on 2025-05-13. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

Microsoft fixes this in updatesKB5058392, KB5058379, KB5058405, KB5058411, KB5058497, KB5058385, KB5058500, KB5058384. The fixed build differs per Windows version, so the row that matters is the one matching the machine you are looking at.

Windows version Fixed in build Update Released
Windows 10 Version 1809 for 32-bit Systems 10.0.17763.7314 KB5058392 2026-09-16
Windows 10 Version 1809 for x64-based Systems 10.0.17763.7314 KB5058392 2026-09-16
Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.5854 KB5058379 2026-09-16
Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.5854 KB5058379 2026-09-16
Windows 10 Version 21H2 for x64-based Systems 10.0.19044.5854 KB5058379 2026-09-16
Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.5854 KB5058379 2026-09-16
Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.5854 KB5058379 2026-09-16
Windows 10 Version 22H2 for x64-based Systems 10.0.19045.5854 KB5058379 2026-09-16
Windows 11 Version 22H2 for ARM64-based Systems 10.0.22621.5335 KB5058405 2026-09-16
Windows 11 Version 22H2 for x64-based Systems 10.0.22621.5335 KB5058405 2026-09-16
Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.5335 KB5058405 2026-09-16
Windows 11 Version 23H2 for x64-based Systems 10.0.22631.5335 KB5058405 2026-09-16
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.4061 KB5058411, KB5058497 2026-09-16
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.4061 KB5058411, KB5058497 2026-09-16
Windows Server 2019 10.0.17763.7314 KB5058392 2026-09-16
Windows Server 2019 (Server Core installation) 10.0.17763.7314 KB5058392 2026-09-16
Windows Server 2022 10.0.20348.3692 KB5058385, KB5058500 2026-09-16
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1611 KB5058384 2026-09-16
Windows Server 2022 (Server Core installation) 10.0.20348.3692 KB5058385 2026-09-16
Windows Server 2025 10.0.26100.4061 KB5058411, KB5058497 2026-09-16
Windows Server 2025 (Server Core installation) 10.0.26100.4061 KB5058411, KB5058497 2026-09-16

Having the KB is not the same as knowing whether a machine has it. Windows updates supersede each other, so the update you installed often covers a fix that shipped in an earlier one. Paste your build into the patch checker and it walks that chain for you.

What it is

Use after free in Windows DWM allows an authorized attacker to elevate privileges locally.

Sources

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H