CVE-2026-45657

CVSS 9.8 · CRITICAL

EPSS p43

Lower risk — in the top 57% least-likely-to-be-exploited CVEs.

Patch available

Vendor advisory or patch linked

Published 6/9/2026 · updated 6/17/2026 · CWE-122, CWE-416

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Summary

Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.

CVSS 9.8 — CRITICAL

9.8 / 10

AV: Network
AC: Low complexity
PR: No privileges
UI: No user interaction
S: Scope unchanged
C: Confidentiality: High
I: Integrity: High
A: Availability: High

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

EPSS exploitation probability

0.6%

Percentile p43 — Lower risk — in the top 57% least-likely-to-be-exploited CVEs.

Affected products

6 vendor/product entries

Microsoft Windows 11 23h2< 10.0.22631.7219
Microsoft Windows 11 24h2< 10.0.26100.8655
Microsoft Windows 11 25h2< 10.0.26200.8655
Microsoft Windows 11 26h1< 10.0.28000.2269
Microsoft Windows Server 2022< 10.0.20348.5256
Microsoft Windows Server 2025< 10.0.26100.32995

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Timeline

Jun 9, 2026 · Disclosed / published in NVD
Jun 17, 2026 · Intel last updated

Intel sources

Which upstream feeds returned data for this CVE, and when they were last fetched.

NVD· 46 days ago
CVE.org· no data
FIRST EPSS· 46 days ago
CISA KEV· no data
OSV· 46 days ago

References

Vendor & CERT advisories1

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657

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