CVE-2025-21335 (GCVE-0-2025-21335)

Vulnerability from cvelistv5 – Published: 2025-01-14 18:04 – Updated: 2026-06-09 18:29
VLAI CISA KEV KEVintel KEV
Title
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Summary
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 21H2 Affected: 10.0.19044.0 , < 10.0.19044.5371 (custom)
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Microsoft Windows 10 Version 22H2 Affected: 10.0.19045.0 , < 10.0.19045.5371 (custom)
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Microsoft Windows 11 version 22H2 Affected: 10.0.22621.0 , < 10.0.22621.4751 (custom)
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Microsoft Windows 11 version 22H3 Affected: 10.0.22631.0 , < 10.0.22631.4751 (custom)
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Microsoft Windows 11 Version 23H2 Affected: 10.0.22631.0 , < 10.0.22631.4751 (custom)
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Microsoft Windows 11 Version 24H2 Affected: 10.0.26100.0 , < 10.0.26100.2894 (custom)
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Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) Affected: 10.0.25398.0 , < 10.0.25398.1369 (custom)
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Microsoft Windows Server 2025 Affected: 10.0.26100.0 , < 10.0.26100.2894 (custom)
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Microsoft Windows Server 2025 (Server Core installation) Affected: 10.0.26100.0 , < 10.0.26100.2894 (custom)
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Date Public
2025-01-14 08:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f575a741-4f4b-4fa8-8c2a-16b77aa96d0d

Vulnerability ID: CVE-2025-21335

Status: Confirmed

Status Updated: 2025-01-14 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-01-14
Asserted: 2025-01-14
Scope
Notes: KEV entry: Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability | Affected: Microsoft / Windows | Description: Microsoft Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability that allows a local attacker to gain SYSTEM privileges. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2025-02-04 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21335 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21335
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-416
Feed CISA Known Exploited Vulnerabilities Catalog
Product Windows
Due Date 2025-02-04
Date Added 2025-01-14
Vendorproject Microsoft
Vulnerabilityname Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:26 UTC | Updated: 2026-02-06 07:17 UTC
KEVintel KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 446f3556-0093-40f4-badb-d79fedc1483d

Vulnerability ID: CVE-2025-21335

Status: Confirmed

Status Updated: 2025-01-14 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-01-14
Asserted: 2025-01-14
Scope
Notes: KEVIntel entry: Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability | Affected: Microsoft / Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation) | CVSS: 7.8 (HIGH) | EPSS: 0.01363 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Vendor Microsoft
Product Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
Added Date 2025-01-14T00:00:00.000Z
Cvss Score 7.8
Epss Score 0.01363
Cvss Severity HIGH
Epss Percentile 0.68189
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-19 12:46 UTC | Updated: 2026-06-19 12:46 UTC
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To clipboard 

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      "cveMetadata": "{\"cveId\": \"CVE-2025-21335\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-26T19:09:14.341Z\", \"dateReserved\": \"2024-12-11T00:29:48.351Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2025-01-14T18:04:17.808Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.