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CVE-2025-21335

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

HIGH
7.8
CVSS Score
Published: January 14, 2025 at 06:04 PM UTC
Updated: September 24, 2026 at 01:27 PM UTC
8 products affected across 1 vendorWindows 10 21H2Windows 10 22H2Windows Server 2025

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Severity
HIGH7.8
Exploitation
CISA KEV
Exploit prediction
EPSS 1%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score1.4%

EPSS (Exploit Prediction Scoring System) estimates a 1.4% chance this CVE is exploited in the wild within the next 30 days — higher than 72% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.
Ransomware Use
Unknown
Added to KEV
Jan 14, 2025
Remediation Due
Feb 4, 2025
633 days overdue
Notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21335
https://nvd.nist.gov/vuln/detail/CVE-2025-21335

Description

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10 21H2· Microsoft
95%
v < 10.0.19044.537110.0.19044.0 ≤ v < 10.0.19044.537110.0.19044.0
Affected range stops below 10.0.19044.5371, so it looks safe — our inference, not a vendor statement
Windows 10 22H2· Microsoft
95%
v < 10.0.19045.537110.0.19045.0 ≤ v < 10.0.19045.537110.0.19045.0
Affected range stops below 10.0.19045.5371, so it looks safe — our inference, not a vendor statement
Windows 11 22H2· Microsoft
95%
v < 10.0.22621.475110.0.22621.0 ≤ v < 10.0.22621.475110.0.22621.0
Affected range stops below 10.0.22621.4751, so it looks safe — our inference, not a vendor statement
Windows 11 23H2· Microsoft
95%
v < 10.0.22631.475110.0.22631.0 ≤ v < 10.0.22631.475110.0.22631.0
Affected range stops below 10.0.22631.4751, so it looks safe — our inference, not a vendor statement
Windows 11 24H2· Microsoft
95%
v < 10.0.26100.289410.0.26100.0 ≤ v < 10.0.26100.289410.0.26100.0
Affected range stops below 10.0.26100.2894, so it looks safe — our inference, not a vendor statement
Windows Server 2022 23H2· Microsoft
95%
v < 10.0.25398.136910.0.25398.0 ≤ v < 10.0.25398.136910.0.25398.0
Affected range stops below 10.0.25398.1369, so it looks safe — our inference, not a vendor statement
Windows Server 2025· Microsoft
95%
v < 10.0.26100.289410.0.26100.0 ≤ v < 10.0.26100.289410.0.26100.0
Affected range stops below 10.0.26100.2894, so it looks safe — our inference, not a vendor statement
Windows Server 23H2· Microsoft
95%
10.0.25398.0 ≤ v < 10.0.25398.1369
Affected range stops below 10.0.25398.1369, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21335
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21335

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-416

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