CVE-2025-21391Known exploitation

Privilege escalation via improper storage link resolution

Published Feb 11, 2025 · Updated Feb 26, 2026

Improper link resolution in Microsoft Windows Storage allows local users to elevate privileges by directing file access through a crafted link. The affected storage operation follows an attacker-controlled link before accessing the file, resolving the request to an unintended resource; Microsoft has not disclosed the responsible function or file path. A low-privileged local account is required, and successful exploitation can modify protected data and interrupt service on the affected host.

CVSS severity7.1
High
EPSS probability2.30%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper link resolution in Microsoft Windows Storage allows local users to elevate privileges by directing file access through a crafted link. The affected storage operation follows an attacker-controlled link before accessing the file, resolving the request to an unintended resource; Microsoft has not disclosed the responsible function or file path. A low-privileged local account is required, and successful exploitation can modify protected data and interrupt service on the affected host.

The record

CVE
CVE-2025-21391
Published
Feb 11, 2025
Updated
Feb 26, 2026
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-59, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=10.0.10240.0 <10.0.10240.20915

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.20915
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.6893
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.3194
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.7785
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.3194
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.5487
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1425
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.7785
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.4890
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.5487
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.6893
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.4890
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.4890
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.7785
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.3207
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.3194
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.6893

Published CVSS scores

7.1Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
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.

Reported exploitation

Technologies

Your stack

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Your stack

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