CVE-2026-40407

28

FAUCET Score

Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

First published: May 12, 2026Last modified: Jun 9, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 10.0.14393.9140CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*
		< 10.0.14393.9140CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_1607:::::::x86:*
		< 10.0.17763.8755CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*
		< 10.0.17763.8755CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_1809:::::::x86:*
		< 10.0.19044.7291CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

1.8

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.30%

Probability of exploitation in next 30 days

EPSS Percentile

22.6%

Percentile rank of EPSS score among Peer Group

As of 2026-07-24

Model: v2026.06.15

This CVE's current EPSS score of 0.0030 is in the 59th percentile among its peer group of 16,974 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (40)

microsoftpatch availablevia msrc

Product: Windows Server 2012 R2 (Server Core installation)Fixed in: 6.3.9600.23181

microsoftpatch availablevia msrc

Product: Windows Server 2022 (Server Core installation)Fixed in: 10.0.20348.5139

microsoftpatch availablevia msrc

Product: Windows Server 2022Fixed in: 10.0.20348.5139

microsoftpatch availablevia msrc

Product: Windows Server 2022 (Server Core installation)Fixed in: 10.0.20348.5074

microsoftpatch availablevia msrc

Product: Windows Server 2022Fixed in: 10.0.20348.5074

microsoftpatch availablevia msrc

Product: Windows Server 2019Fixed in: 10.0.17763.8755

microsoftpatch availablevia msrc

Product: Windows 10 Version 1809 for 32-bit SystemsFixed in: 10.0.17763.8755

microsoftpatch availablevia msrc

Product: Windows 10 Version 1809 for x64-based SystemsFixed in: 10.0.17763.8755

microsoftpatch availablevia msrc

Product: Windows Server 2019 (Server Core installation)Fixed in: 10.0.17763.8755

microsoftpatch availablevia msrc

Product: Windows 10 Version 21H2 for x64-based SystemsFixed in: 10.0.19044.7291

microsoftpatch availablevia msrc

Product: Windows 10 Version 21H2 for 32-bit SystemsFixed in: 10.0.19044.7291

microsoftpatch availablevia msrc

Product: Windows 10 Version 21H2 for ARM64-based SystemsFixed in: 10.0.19044.7291

microsoftpatch availablevia msrc

Product: Windows 10 Version 22H2 for x64-based SystemsFixed in: 10.0.19045.7417

microsoftpatch availablevia msrc

Product: Windows 10 Version 22H2 for 32-bit SystemsFixed in: 10.0.19045.7417

microsoftpatch availablevia msrc

Product: Windows 10 Version 22H2 for ARM64-based SystemsFixed in: 10.0.19045.7417

microsoftpatch availablevia msrc

Product: Windows Server 2025 (Server Core installation)Fixed in: 10.0.26100.32860

microsoftpatch availablevia msrc

Product: Windows Server 2025Fixed in: 10.0.26100.32860

microsoftpatch availablevia msrc

Product: Windows Server 2025 (Server Core installation)Fixed in: 10.0.26100.32772

microsoftpatch availablevia msrc

Product: Windows Server 2025Fixed in: 10.0.26100.32772

microsoftpatch availablevia msrc

Product: Windows 11 Version 25H2 for x64-based SystemsFixed in: 10.0.26200.8457

microsoftpatch availablevia msrc

Product: Windows 11 Version 25H2 for ARM64-based SystemsFixed in: 10.0.26200.8457

microsoftpatch availablevia msrc

Product: Windows 11 Version 25H2 for x64-based SystemsFixed in: 10.0.26200.8390

microsoftpatch availablevia msrc

Product: Windows 11 Version 25H2 for ARM64-based SystemsFixed in: 10.0.26200.8390

microsoftpatch availablevia msrc

Product: Windows 11 Version 23H2 for x64-based SystemsFixed in: 10.0.22631.7219

microsoftpatch availablevia msrc

Product: Windows 11 Version 23H2 for ARM64-based SystemsFixed in: 10.0.22631.7079

microsoftpatch availablevia msrc

Product: Windows Server 2022, 23H2 Edition (Server Core installation)Fixed in: 10.0.25398.2330

microsoftpatch availablevia msrc

Product: Windows 11 Version 24H2 for ARM64-based SystemsFixed in: 10.0.26100.8457

microsoftpatch availablevia msrc

Product: Windows 11 Version 24H2 for x64-based SystemsFixed in: 10.0.26100.8457

microsoftpatch availablevia msrc

Product: Windows 11 Version 24H2 for ARM64-based SystemsFixed in: 10.0.26100.8390

microsoftpatch availablevia msrc

Product: Windows 11 Version 24H2 for x64-based SystemsFixed in: 10.0.26100.8390

microsoftpatch availablevia msrc

Product: Windows 11 version 26H1 for x64-based SystemsFixed in: 10.0.28000.2113

microsoftpatch availablevia msrc

Product: Windows 11 Version 26H1 for ARM64-based SystemsFixed in: 10.0.28000.2113

microsoftpatch availablevia msrc

Product: Windows 10 Version 1607 for 32-bit SystemsFixed in: 10.0.14393.9140

microsoftpatch availablevia msrc

Product: Windows 10 Version 1607 for x64-based SystemsFixed in: 10.0.14393.9140

microsoftpatch availablevia msrc

Product: Windows Server 2016Fixed in: 10.0.14393.9140

microsoftpatch availablevia msrc

Product: Windows Server 2016 (Server Core installation)Fixed in: 10.0.14393.9140

microsoftpatch availablevia msrc

Product: Windows Server 2012 (Server Core installation)Fixed in: 6.2.9200.26079

microsoftpatch availablevia msrc

Product: Windows Server 2012Fixed in: 6.2.9200.26079

microsoftpatch availablevia msrc

Product: Windows Server 2012 R2Fixed in: 6.3.9600.23181

microsoftvendor investigatingvia nvd_reference

Vendor Advisories (1)

microsoft2026-May/CVE-2026-40407Important

Windows Common Log File System Driver Elevation of Privilege Vulnerability

References

msrc.microsoft.com / update-guide/vulnerability/CVE-2026-40407

Vendor Advisory