CVE-2025-21333

highpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.101 · 96 %ileexploit · PoCDEEUNLRUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 5 exploits · PoC

Likely / severe?

10.1% (96th) EPSS

CVSS 7.8 · high

Is it mine?

73 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

added 2025-01-14remediate by 2025-02-04

required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

EPSS · scored 2026-10-26

Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability

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

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedWindows 10 Version 21H2 for x64-based Systemsmsrc_csaf
10.0.19044.5371:Security Update:https://support.microsoft.com/help/5049981
https://support.microsoft.com/help/5049981
FixedWindows 10 Version 22H2 for x64-based Systemsmsrc_csaf
10.0.19045.5371:Security Update:https://support.microsoft.com/help/5049981
https://support.microsoft.com/help/5049981
FixedWindows 11 Version 22H2 for ARM64-based Systemsmsrc_csaf
10.0.22621.4751:Security Update:https://support.microsoft.com/help/5050021
https://support.microsoft.com/help/5050021
FixedWindows 11 Version 22H2 for x64-based Systemsmsrc_csaf
10.0.22621.4751:Security Update:https://support.microsoft.com/help/5050021
https://support.microsoft.com/help/5050021
FixedWindows 11 Version 23H2 for ARM64-based Systemsmsrc_csaf
10.0.22631.4751:Security Update:https://support.microsoft.com/help/5050021
https://support.microsoft.com/help/5050021
FixedWindows 11 Version 23H2 for x64-based Systemsmsrc_csaf
10.0.22631.4751:Security Update:https://support.microsoft.com/help/5050021
https://support.microsoft.com/help/5050021
FixedWindows 11 Version 24H2 for ARM64-based Systemsmsrc_csaf
10.0.26100.2894:Security Update:https://support.microsoft.com/help/5050009
https://support.microsoft.com/help/5050009
FixedWindows 11 Version 24H2 for x64-based Systemsmsrc_csaf
10.0.26100.2894:Security Update:https://support.microsoft.com/help/5050009
https://support.microsoft.com/help/5050009
FixedWindows Server 2022, 23H2 Edition (Server Core installation)msrc_csaf
10.0.25398.1369:Security Update:https://support.microsoft.com/help/5049984
https://support.microsoft.com/help/5049984
FixedWindows Server 2025msrc_csaf
10.0.26100.2894:Security Update:https://support.microsoft.com/help/5050009
https://support.microsoft.com/help/5050009
FixedWindows Server 2025 (Server Core installation)msrc_csaf
10.0.26100.2894:Security Update:https://support.microsoft.com/help/5050009
https://support.microsoft.com/help/5050009

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.8highAV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 1.8 · impact 5.9

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · NCSC-NL NL

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-122USCWE-122USCWE-122USCWE-122US

ATT&CK techniques

ATT&CK techniques this enables or maps to.

exploits (5)

Public proof-of-concept and weaponised exploit code.

EDB-52436Microsoft Windows Server 2025 Hyper-V NT Kernel Integration VSP - Elevation of PrivilegePoC · exploit_db
MrAle98/CVE-2025-21333-POCPOC exploit for CVE-2025-21333 heap-based buffer overflow. It leverages WNF state data and I/O ring IOP_MC_BUFFER_ENTRYPoC · poc_in_github
aleongx/KQL_sentinel_CVE-2025-21333KQL para deteccion de CVE-2025-21333 en SentinelPoC · poc_in_github
nu1lptr0/CVE-2025-21333LPE due to integer truncation in vskrnlintvsp.sysPoC · poc_in_github
uname1able/CVE-2025-21333uname1able/CVE-2025-21333PoC · poc_in_github

affected products (73)

Products and version ranges known to be affected.

Hitachi Network Attached Storageall versionscert_bundDEcpe:/h:hitachi:virtual_storage_platform:-
Microsoft Windows 10all versionscert_bundDEcpe:/o:microsoft:windows_10:-
Microsoft Windows 10 Version 1607all versionscert_bundDEcpe:/o:microsoft:windows_10:version_1607
Microsoft Windows 10 Version 1809all versionscert_bundDEcpe:/o:microsoft:windows_10:version_1809
Microsoft Windows 10 Version 21H2all versionscert_bundDEcpe:/o:microsoft:windows_10:version_21h2
Microsoft Windows 10 Version 22H2all versionscert_bundDEcpe:/o:microsoft:windows_10:version_22h2
Microsoft Windows 11 Version 22H2all versionscert_bundDEcpe:/o:microsoft:windows_11:version_22h2
Microsoft Windows 11 Version 23H2all versionscert_bundDEcpe:/o:microsoft:windows_11:version_23h2
Microsoft Windows 11 Version 24H2all versionscert_bundDEcpe:/o:microsoft:windows_11:version_24h2
Microsoft Windows Server 2008 R2 SP1all versionscert_bundDEcpe:/o:microsoft:windows_server:2008_r2_sp1
Microsoft Windows Server 2008 SP2all versionscert_bundDEcpe:/o:microsoft:windows_server:2008_sp2
Microsoft Windows Server 2012all versionscert_bundDEcpe:/o:microsoft:windows_server_2012:-
Microsoft Windows Server 2012 R2all versionscert_bundDEcpe:/o:microsoft:windows_server_2012_r2:-
Microsoft Windows Server 2016all versionscert_bundDEcpe:/o:microsoft:windows_server_2016:-
Microsoft Windows Server 2019all versionscert_bundDEcpe:/o:microsoft:windows_server_2019:-
Microsoft Windows Server 2022all versionscert_bundDEcpe:/o:microsoft:windows_server_2022:-
Microsoft Windows Server 2022 23H2 Editionall versionscert_bundDEcpe:/o:microsoft:windows_server_2022:23h2_edition
Microsoft Windows Server 2025all versionscert_bundDEcpe:/o:microsoft:windows_server:2025
Microsoft Windows 10 Version 21H210.0.19044.0 → 10.0.19044.5371enisa_euvdEU
Microsoft Windows 10 Version 22H210.0.19045.0 → 10.0.19045.5371enisa_euvdEU

showing 20 of 73

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2025-0010Kwetsbaarheden verholpen in Microsoft WindowsNL2025-01-14csaf · ncsc_nlNL
Microsoft heeft kwetsbaarheden verholpen in Windows.
WID-SEC-W-2025-0091Microsoft Windows: Mehrere SchwachstellenDeutsch2025-01-14csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows und Microsoft Windows Server ausnutzen, um seine Privilegien zu erhöhen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, einen Spoofing-Angriff durchzuführen, vertrauliche Informationen preiszugeben und einen Denial-of-Service-Zustand zu erzeugen.
msrc_CVE-2025-21333Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability2025-01-14csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund ncsc_nl msrc_csaf NVD CVE.org MITRE

published 2025-01-14modified 2026-06-17

references (9)

External citations — patches, advisories, analysis.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333 cnnvd
https://nvd.nist.gov/vuln/detail/CVE-2025-21333 cnnvd
https://www.exploit-db.com/exploits/52436 cnnvd
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333 enisa_euvd
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333PatchVendor Advisorynvd
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333US Government Resourcenvd
https://www.exploit-db.com/exploits/52436ExploitThird Party AdvisoryVDB Entrynvd
https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-scriptMitigationThird Party Advisorynvd

scry

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