Is CVE-2026-45657 in the CISA KEV catalog?

No. CVE-2026-45657 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-45657?

CVE-2026-45657 has a CVSS v3 base score of 9.8 (Critical).

What is the EPSS score for CVE-2026-45657?

CVE-2026-45657 has an EPSS score of 15.48% (96th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-45657?

Install KB5093998 for Windows 11 Version 23H2. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2026-45657

CRITICALEPSS 96th pctl

9.8

CVSS v3

NVD

Description

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

CWE-122Heap-based Buffer Overflow CWE-416Use After Free

How to fix

Remediation Available

Windows 11 Version 23H2Windows

Install:KB5093998Microsoft

Windows 11 Version 24H2Windows

Install:KB5094126Microsoft

Windows 11 Version 25H2Windows

Install:KB5094126Microsoft

Windows 11 Version 26H1Windows

Install:KB5095051Microsoft

Windows 11 version 26H1Windows

Install:KB5095051Microsoft

Windows Server 2022Windows

Install:KB5094128Microsoft

Windows Server 2022 (Server Core installation)Windows

Install:KB5094128Microsoft

Windows Server 2025Windows

Install:KB5094125Microsoft

Windows Server 2025 (Server Core installation)Windows

Install:KB5094125Microsoft

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

15.48%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

Vendor Advisory1

msrc.microsoft.com

Related Vulnerabilities

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2024-26256	High	7.8	88%	-	Fix
CVE-2020-25687	Medium	5.9	87%	-	Fix
CVE-2009-3459	High	8.8	87%	KEV	Fix
CVE-2021-21017	High	8.8	86%	KEV	-
CVE-2020-25683	Medium	5.9	86%	-	Fix

Embed a live status badge for CVE-2026-45657

Markdown

[![CVE-2026-45657](https://tridentstack.com/cve/badge/CVE-2026-45657.svg)](https://tridentstack.com/cve/CVE-2026-45657)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-45657"><img src="https://tridentstack.com/cve/badge/CVE-2026-45657.svg" alt="CVE-2026-45657"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-10.