Secuno
ENNL
Book demo

CVE-2025-21335

Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free

7.8 HIGHActively exploited (CISA KEV)EPSS 1.39%
  1. Published14 Jan 2025
  2. Added to CISA KEV14 Jan 2025
  3. Remediation due4 Feb 2025
Actively exploited (CISA KEV)

Microsoft Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability that allows a local attacker to gain SYSTEM privileges.

Added to KEV: 14 Jan 2025Federal remediation due: 4 Feb 2025

Description

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

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 10 21h2< 10.0.19044.5371
Microsoft Windows 10 22h2< 10.0.19045.5371
Microsoft Windows 11 22h2< 10.0.22621.4751
Microsoft Windows 11 23h2< 10.0.22631.4751
Microsoft Windows 11 24h2< 10.0.26100.2894
Microsoft Windows Server 2022 23h2< 10.0.25398.1369
Microsoft Windows Server 2025< 10.0.26100.2894

Remediation

Fixed in
Microsoft Windows 10 21h2≥ 10.0.19044.5371
Microsoft Windows 10 22h2≥ 10.0.19045.5371
Microsoft Windows 11 22h2≥ 10.0.22621.4751
Microsoft Windows 11 23h2≥ 10.0.22631.4751
Microsoft Windows 11 24h2≥ 10.0.26100.2894
Microsoft Windows Server 2022 23h2≥ 10.0.25398.1369
Microsoft Windows Server 2025≥ 10.0.26100.2894

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-859658.0
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7…
CVE-2026-57599.8
A double free and use-after-free vulnerability in the RdbLoadDeletedNodes function of…
CVE-2026-1071838.1
llama.cpp before b11393 contains a use-after-free and double free vulnerability in…
CVE-2026-553309.8
In BluetoothCccHandlerCallbackImpl of bluetooth_ccc.cc, there is a possible…
CVE-2026-1064238.8
Use after free in Media in Google Chrome prior to 155.0.8059.39 allowed a remote…
CVE-2026-1064218.8
Use after free in PDF in Google Chrome prior to 155.0.8059.39 allowed a remote attacker…

Frequently asked

Is CVE-2025-21335 being actively exploited?

Yes. CVE-2025-21335 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 14 Jan 2025.

How severe is CVE-2025-21335?

CVE-2025-21335 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 1.39% probability of exploitation.

Which products are affected by CVE-2025-21335?

Affected products include Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, and 2 more.

How do I fix CVE-2025-21335?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 21h2 10.0.19044.5371, Microsoft Windows 10 22h2 10.0.19045.5371, Microsoft Windows 11 22h2 10.0.22621.4751 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-21335 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.