CVE-2025-62221

highpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.025 · 85 %ileexploit · PoCDEEUJPNLRUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 1 exploit · PoC

Likely / severe?

2.50% (85th) EPSS

CVSS 7.8 · high

Is it mine?

150 products

Check your exposure

Who says so?

7 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

added 2025-12-09remediate by 2025-12-30

required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

EPSS · scored 2026-10-22

Microsoft Windows Use After Free Vulnerability

Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

remediations

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

A vendor fix is available.

FixedWindows 10 Version 1809 for 32-bit Systemsmsrc_csaf
10.0.17763.8146:Security Update:https://support.microsoft.com/help/5071544
https://support.microsoft.com/help/5071544
FixedWindows 10 Version 1809 for x64-based Systemsmsrc_csaf
10.0.17763.8146:Security Update:https://support.microsoft.com/help/5071544
https://support.microsoft.com/help/5071544
FixedWindows 10 Version 21H2 for 32-bit Systemsmsrc_csaf
10.0.19044.6691:Security Update:https://support.microsoft.com/help/5071546
https://support.microsoft.com/help/5071546
FixedWindows 10 Version 21H2 for ARM64-based Systemsmsrc_csaf
10.0.19044.6691:Security Update:https://support.microsoft.com/help/5071546
https://support.microsoft.com/help/5071546
FixedWindows 10 Version 21H2 for x64-based Systemsmsrc_csaf
10.0.19044.6691:Security Update:https://support.microsoft.com/help/5071546
https://support.microsoft.com/help/5071546
FixedWindows 10 Version 22H2 for 32-bit Systemsmsrc_csaf
10.0.19045.6691:Security Update:https://support.microsoft.com/help/5071546
https://support.microsoft.com/help/5071546
FixedWindows 10 Version 22H2 for ARM64-based Systemsmsrc_csaf
10.0.19045.6691:Security Update:https://support.microsoft.com/help/5071546
https://support.microsoft.com/help/5071546
FixedWindows 10 Version 22H2 for x64-based Systemsmsrc_csaf
10.0.19045.6691:Security Update:https://support.microsoft.com/help/5071546
https://support.microsoft.com/help/5071546
FixedWindows 11 Version 23H2 for ARM64-based Systemsmsrc_csaf
10.0.22631.6345:Security Update:https://support.microsoft.com/help/5071417
https://support.microsoft.com/help/5071417
FixedWindows 11 Version 23H2 for x64-based Systemsmsrc_csaf
10.0.22631.6345:Security Update:https://support.microsoft.com/help/5071417
https://support.microsoft.com/help/5071417
FixedWindows 11 Version 24H2 for ARM64-based Systemsmsrc_csaf
10.0.26100.7392:Security Hotpatch Update:https://support.microsoft.com/help/5072014
https://support.microsoft.com/help/5072014
FixedWindows 11 Version 24H2 for x64-based Systemsmsrc_csaf
10.0.26100.7392:Security Hotpatch Update:https://support.microsoft.com/help/5072014
https://support.microsoft.com/help/5072014
FixedWindows 11 Version 25H2 for ARM64-based Systemsmsrc_csaf
10.0.26200.7392:Security Hotpatch Update:https://support.microsoft.com/help/5072014
https://support.microsoft.com/help/5072014
FixedWindows 11 Version 25H2 for x64-based Systemsmsrc_csaf
10.0.26200.7392:Security Hotpatch Update:https://support.microsoft.com/help/5072014
https://support.microsoft.com/help/5072014
FixedWindows Server 2019msrc_csaf
10.0.17763.8146:Security Update:https://support.microsoft.com/help/5071544
https://support.microsoft.com/help/5071544
FixedWindows Server 2019 (Server Core installation)msrc_csaf
10.0.17763.8146:Security Update:https://support.microsoft.com/help/5071544
https://support.microsoft.com/help/5071544
FixedWindows Server 2022msrc_csaf
10.0.20348.4467:Security Hotpatch Update:https://support.microsoft.com/help/5071413
https://support.microsoft.com/help/5071413
FixedWindows Server 2022 (Server Core installation)msrc_csaf
10.0.20348.4467:Security Hotpatch Update:https://support.microsoft.com/help/5071413
https://support.microsoft.com/help/5071413
FixedWindows Server 2022, 23H2 Edition (Server Core installation)msrc_csaf
10.0.25398.2025:Security Update:https://support.microsoft.com/help/5071542
https://support.microsoft.com/help/5071542
FixedWindows Server 2025msrc_csaf
10.0.26100.7392:Security Hotpatch Update:https://support.microsoft.com/help/5072014
https://support.microsoft.com/help/5072014
FixedWindows Server 2025 (Server Core installation)msrc_csaf
10.0.26100.7392:Security Hotpatch Update:https://support.microsoft.com/help/5072014
https://support.microsoft.com/help/5072014

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-416USCWE-416USCWE-416USCWE-416US

exploits (1)

Public proof-of-concept and weaponised exploit code.

Teodor1231241/DEMO-Proof-of-Concept-Temporal-Memory-Inconsistency-in-cldflt.sys-CVE-2025-62221Teodor1231241/DEMO-Proof-of-Concept-Temporal-Memory-Inconsistency-in-cldflt.sys-CVE-2025-62221PoC · poc_in_github

affected products (150)

Products and version ranges known to be affected.

Hitachi Storageall versionscert_bundDEcpe:/h:hitachi:storage:-
Microsoft Exchange Server 2016 Cumulative Update 23all versionscert_bundDEcpe:/a:microsoft:exchange_server_2016:cumulative_update_23
Microsoft Exchange Server 2019 Cumulative Update 14all versionscert_bundDEcpe:/a:microsoft:exchange_server_2019:cumulative_update_14
Microsoft Exchange Server 2019 Cumulative Update 15all versionscert_bundDEcpe:/a:microsoft:exchange_server_2019:cumulative_update_15
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 11 Windows Terminalall versionscert_bundDEcpe:/o:microsoft:windows_11:windows_terminal
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:-

showing 20 of 150

advisories (4)

Vendor and ecosystem advisories describing this.

NCSC-2025-0383Kwetsbaarheden verholpen in Microsoft WindowsNL2025-12-09csaf · ncsc_nlNL
Microsoft heeft kwetsbaarheden verholpen in Windows.
WID-SEC-W-2025-2781Microsoft Windows: Mehrere SchwachstellenDeutsch2025-12-09csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Microsoft Windows und Microsoft Windows Server ausnutzen, um beliebigen Programmcode auszuführen, Rechte zu eskalieren, vertrauliche Informationen auszulesen oder den Host zum Absturz zu bringen.
msrc_CVE-2025-62221Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability2025-12-09csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
JVNDB-2026-001582JVN iPedia advisory JVNDB-2026-0015822026-01-21vendor · jvndbJP

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 jvndb NVD CVE.org MITRE

published 2025-12-09modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

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