CVE-2025-55334 — Windows Kernel Security Feature Bypass Vulnerability

Executive Summary

Cleartext storage of sensitive information in Windows Kernel allows an unauthorized attacker to bypass a security feature locally.

Overview

5.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Oct 14 2025

Last Updated Oct 14 2025

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.0032 — 0.23522 percentile

NVD CVSS 5.5 MEDIUM — differs from MSRC

CVSS Vector

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

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 5.4

EPSS Score

0.0032

probability of exploitation in the next 30 days

0.23522 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

8 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 11 Version 22H2 for ARM64-based Systems	`5066793 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 22H2 for x64-based Systems	`5066793 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 23H2 for ARM64-based Systems	`5066793 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 23H2 for x64-based Systems	`5066793 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 24H2 for ARM64-based Systems	`5066835 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 24H2 for x64-based Systems	`5066835 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 25H2 for ARM64-based Systems	`5066835 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 25H2 for x64-based Systems	`5066835 (Security Update)`	Important	Security Feature Bypass	Yes

Patches

2 patches

Article	Type	Restart
`5066793`	Security Update	Yes
`5066835`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Microsoft Offensive Research & Security Engineering

References

MSRC Advisory MITRE NVD