CVE-2025-64673

Local privilege escalation via undisclosed access control

Published Dec 9, 2025 · Updated Apr 16, 2026

Improper access control in Microsoft's Storvsp.sys driver allows local users with low privileges to elevate privileges on affected Windows systems. Microsoft has not published the specific code path or wrong operation that permits the driver to bypass its intended access controls. Successful exploitation requires existing local low-privileged access and grants elevated Windows privileges.

CVSS severity7.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Microsoft's Storvsp.sys driver allows local users with low privileges to elevate privileges on affected Windows systems. Microsoft has not published the specific code path or wrong operation that permits the driver to bypass its intended access controls. Successful exploitation requires existing local low-privileged access and grants elevated Windows privileges.

The record

CVE
CVE-2025-64673
Published
Dec 9, 2025
Updated
Apr 16, 2026
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-284, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2026Record 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 <10.0.17763.8146

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.8146
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.7462
Microsoft · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.7462
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.7462
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.6691
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.2025
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.6345
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.6691
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.8146
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.6345
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.4529
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.7462
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.8146

Published CVSS scores

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1068Exploitation for Privilege Escalation

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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