CVE-2026-45657

Name: CVE-2026-45657
Creator: NVD / NIST
Published: 2026-06-09T17:17:33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 15.48%

Last modified Jun 17, 2026

CVE-2026-45657 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.. EPSS estimates a 15.48% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

15.48%

96.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
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

References

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

Timeline

Published: Jun 9, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-45657?

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

How severe is CVE-2026-45657?

CVE-2026-45657 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 15.48% probability of exploitation in the next 30 days.

How do I fix CVE-2026-45657?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-45657?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST