Vulnerability report

Trusted Third Party Report Confirmed Confidence In CISA KEV

CVE-2025-21391

Windows Storage Elevation of Privilege Vulnerability

Microsoft / Windows 10 Version 1507 · affected before 10.0.10240.20915

Watch CVE-2025-21391 Browse KEV feed
Severity
CVSS 7.1 · High
Confidence
Confirmed
Exploit status
Trusted Third Party Report
EPSS
2.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-21391 is Windows Storage Elevation of Privilege Vulnerability affecting Microsoft Windows 10 Version 1507 and 17 other products.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Confidence is confirmed.

Who is affected?

Affected products include Microsoft / Windows 10 Version 1507 and 17 other products, including affected before 10.0.10240.20915, affected before 10.0.14393.7785, and affected before 10.0.17763.6893.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Windows Storage Elevation of Privilege Vulnerability

Windows Storage Elevation of Privilege Vulnerability

Microsoft Affected
Windows 10 Version 1507
Before 10.0.10240.20915
Microsoft Affected
Windows 10 Version 1607
Before 10.0.14393.7785
Microsoft Affected
Windows 10 Version 1809
Before 10.0.17763.6893
Microsoft Affected
Windows 10 Version 21H2
Before 10.0.19044.5487
Microsoft Affected
Windows 10 Version 22H2
Before 10.0.19045.5487
Microsoft Affected
Windows 11 version 22H2
Before 10.0.22621.4890
Microsoft Affected
Windows 11 version 22H3
Before 10.0.22631.4890
Microsoft Affected
Windows 11 Version 23H2
Before 10.0.22631.4890
Microsoft Affected
Windows 11 Version 24H2
Before 10.0.26100.3194
Microsoft Affected
Windows Server 2016
Before 10.0.14393.7785
Microsoft Affected
Windows Server 2016 (Server Core installation)
Before 10.0.14393.7785
Microsoft Affected
Windows Server 2019
Before 10.0.17763.6893
Microsoft Affected
Windows Server 2019 (Server Core installation)
Before 10.0.17763.6893
Microsoft Affected
Windows Server 2022
Before 10.0.20348.3207
Microsoft Affected
Windows Server 2022, 23H2 Edition (Server Core installation)
Before 10.0.25398.1425
Microsoft Affected
Windows Server 2025
Before 10.0.26100.3194
Microsoft Affected
Windows Server 2025 (Server Core installation)
Before 10.0.26100.3194
View vendor advisory (opens in new tab)
Published
11 Feb 2025
Exploitation Attempts Reported
11 Feb 2025
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None

Tags

microsoft cisa nessus_scanner windows

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

CISA

Recorded 11 Feb 2025

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CISA First 2025-02-11 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nessus https://www.tenable.com/plugins/nessus/216140 02 Jun 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.1 High

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

2.3%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

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

Timeline

From disclosure to observed exploitation attempts

  1. 09:25 UTC

    Nessus plugin available

    Scanner coverage available

  2. 17:58 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 00:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  4. 00:29 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

Start 14-day Pro trial Read API docs
  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-21391

Sample API response 
{
  "cve_id": "CVE-2025-21391",
  "confidence": "Confirmed",
  "cvss_score": 7.1,
  "cvss_estimated": false,
  "epss_score": 0.02284,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}