CVE-2025-55338

21

FAUCET Score

CVE-2025-55338 is a medium-severity vulnerability affecting Microsoft Windows BitLocker, allowing an unauthorized attacker to bypass a security feature through a physical attack due to a missing ability to patch ROM code. With a CVSS score of 4.6, this vulnerability requires physical access (AV:P) but has low attack complexity (AC:L) and no user interaction, potentially leading to high confidentiality impact (C:H). While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability has garnered some community discussion and media coverage, indicating awareness within the security community.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 10.0.10240.21161CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_1507::::::::
		< 10.0.14393.8519CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_1607::::::::
		< 10.0.17763.7919CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_1809::::::::
		< 10.0.19044.6456CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_21h2::::::::
		< 10.0.19045.6456CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_22h2::::::::

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector

PHYSICAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

Exploitability Score

0.9

Impact Score

5.2

CvssVersion

3.1

Exploit Intelligence

EPSS Score

2.98%

Probability of exploitation in next 30 days

EPSS Percentile

85.9%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0298 is in the 100th percentile among its peer group of 1,531 CVEs.

Social Chatter

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

Media Mentions

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (30)

microsoftpatch availablevia msrc

Product: Windows Server 2016 (Server Core installation)Fixed in: 10.0.14393.8519

microsoftpatch availablevia msrc

Product: Windows 11 Version 25H2 for x64-based SystemsFixed in: 10.0.26200.6899

microsoftpatch availablevia msrc

Product: Windows 11 Version 25H2 for ARM64-based SystemsFixed in: 10.0.26200.6899

microsoftpatch availablevia msrc

Product: Windows 10 Version 1809 for 32-bit SystemsFixed in: 10.0.17763.7919

microsoftpatch availablevia msrc

Product: Windows 10 Version 1809 for x64-based SystemsFixed in: 10.0.17763.7919

microsoftpatch availablevia msrc

Product: Windows Server 2019Fixed in: 10.0.17763.7919

microsoftpatch availablevia msrc

Product: Windows Server 2019 (Server Core installation)Fixed in: 10.0.17763.7919

microsoftpatch availablevia msrc

Product: Windows Server 2022Fixed in: 10.0.20348.4294

microsoftpatch availablevia msrc

Product: Windows Server 2022 (Server Core installation)Fixed in: 10.0.20348.4294

microsoftpatch availablevia msrc

Product: Windows 10 Version 21H2 for 32-bit SystemsFixed in: 10.0.19044.6456

microsoftpatch availablevia msrc

Product: Windows 10 Version 21H2 for ARM64-based SystemsFixed in: 10.0.19044.6456

microsoftpatch availablevia msrc

Product: Windows 10 Version 21H2 for x64-based SystemsFixed in: 10.0.19044.6456

microsoftpatch availablevia msrc

Product: Windows 11 Version 22H2 for ARM64-based SystemsFixed in: 10.0.22621.6060

microsoftpatch availablevia msrc

Product: Windows 11 Version 22H2 for x64-based SystemsFixed in: 10.0.22621.6060

microsoftpatch availablevia msrc

Product: Windows 10 Version 22H2 for x64-based SystemsFixed in: 10.0.19045.6456

microsoftpatch availablevia msrc

Product: Windows 10 Version 22H2 for ARM64-based SystemsFixed in: 10.0.19045.6456

microsoftpatch availablevia msrc

Product: Windows 10 Version 22H2 for 32-bit SystemsFixed in: 10.0.19045.6456

microsoftpatch availablevia msrc

Product: Windows Server 2025 (Server Core installation)Fixed in: 10.0.26100.6899

microsoftpatch availablevia msrc

Product: Windows 11 Version 24H2 for ARM64-based SystemsFixed in: 10.0.26100.6899

microsoftpatch availablevia msrc

Product: Windows 11 Version 24H2 for x64-based SystemsFixed in: 10.0.26100.6899

microsoftpatch availablevia msrc

Product: Windows Server 2025Fixed in: 10.0.26100.6899

microsoftpatch availablevia msrc

Product: Windows 11 Version 23H2 for ARM64-based SystemsFixed in: 10.0.22631.6060

microsoftpatch availablevia msrc

Product: Windows 11 Version 23H2 for x64-based SystemsFixed in: 10.0.22631.6060

microsoftpatch availablevia msrc

Product: Windows Server 2022, 23H2 Edition (Server Core installation)Fixed in: 10.0.25398.1913

microsoftpatch availablevia msrc

Product: Windows 10 for 32-bit SystemsFixed in: 10.0.10240.21161

microsoftpatch availablevia msrc

Product: Windows 10 for x64-based SystemsFixed in: 10.0.10240.21161

microsoftpatch availablevia msrc

Product: Windows 10 Version 1607 for 32-bit SystemsFixed in: 10.0.14393.8519

microsoftpatch availablevia msrc

Product: Windows 10 Version 1607 for x64-based SystemsFixed in: 10.0.14393.8519

microsoftpatch availablevia msrc

Product: Windows Server 2016Fixed in: 10.0.14393.8519

microsoftvendor investigatingvia nvd_reference

Vendor Advisories (1)

microsoft2025-Oct/CVE-2025-55338Important

Windows BitLocker Security Feature Bypass Vulnerability

References

msrc.microsoft.com / update-guide/vulnerability/CVE-2025-55338

Vendor Advisory