CVE-2025-55679Hinoki check available

Local information disclosure via undisclosed kernel input

Published Oct 14, 2025 · Updated Oct 14, 2025

Improper input validation in the Windows Kernel allows local users to disclose sensitive information on affected Windows systems. Microsoft has not published the affected kernel interface, the rejected validation, or the input that reaches it. Exploitation requires local access and high complexity, requires no prior privileges or user interaction, and affects confidentiality only.

CVSS severity5.1
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper input validation in the Windows Kernel allows local users to disclose sensitive information on affected Windows systems. Microsoft has not published the affected kernel interface, the rejected validation, or the input that reaches it. Exploitation requires local access and high complexity, requires no prior privileges or user interaction, and affects confidentiality only.

The record

CVE
CVE-2025-55679
Published
Oct 14, 2025
Updated
Oct 14, 2025
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-20, CWE-200
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.17763.0 <10.0.17763.7919

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.7919
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.6899
Microsoft · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.6899
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.6899
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.6456
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1913
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.6060
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.6456
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.7919
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.6060
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.6060
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.4294
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.6899
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.7919

Published CVSS scores

5.1Microsoft CorporationCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.7NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-200Exposure of Sensitive Information to an Unauthorized Actor

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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