CVE-2025-21343

highpriority · track · 0EPSS 0.014 · 72 %ileDEEUNLUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.37% (72nd) EPSS

CVSS 7.5 · high

Is it mine?

41 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · ncsc_nl

EPSS · scored 2026-10-27

Windows Web Threat Defense User Service Information Disclosure Vulnerability

remediations

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

A vendor fix is available.

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

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:Csecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · secure@microsoft.com USexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:Csecondary · NCSC-NL NL

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

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

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-269USCWE-269USCWE-269US

affected products (41)

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 11 Version 23H210.0.22631.0 → 10.0.22631.4751enisa_euvdEU
Microsoft Windows 11 Version 24H210.0.26100.0 → 10.0.26100.2894enisa_euvdEU

showing 20 of 41

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-2025-21343Windows Web Threat Defense User Service Information Disclosure 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 (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund ncsc_nl msrc_csaf NVD CVE.org MITRE

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

references (4)

External citations — patches, advisories, analysis.

scry

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