CVE-2026-21265

mediumPriorität · verfolgen · 0EPSS 0.011 · 65. PerzentilDEEUJPNLRUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.10% (65th) EPSS

CVSS 6.4 · medium

Is it mine?

181 products

Prüfe deine Angriffsfläche

Who says so?

7 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · bewertet 2026-10-26

Windows Secure Boot stores Microsoft certificates in the UEFI KEK and DB. These original certificates are approaching expiration, and devices containing affected certificate versions must update them to maintain Secure Boot functionality and avoid compromising security by losing security fixes related to Windows boot manager or Secure Boot. The operating system’s certificate update protection mechanism relies on firmware components that might contain defects, which can cause certificate trust updates to fail or behave unpredictably. This leads to potential disruption of the Secure Boot trust chain and requires careful validation and deployment to restore intended security guarantees. Certificate Authority (CA) Location Purpose Expiration Date Microsoft Corporation KEK CA 2011 KEK Signs updates to the DB and DBX 06/24/2026 Microsoft Corporation UEFI CA 2011 DB Signs 3rd party boot loaders, Option ROMs, etc. 06/27/2026 Microsoft Windows Production PCA 2011 DB Signs the Windows Boot Manager 10/19/2026 For more information see this CVE and Windows Secure Boot certificate expiration and CA updates.

Behebungen

Hersteller-Fix, Mitigation oder Workaround, wie von den Quellen veröffentlicht.

Ein Hersteller-Fix ist verfügbar.

BehobenWindows 10 Version 1607 for 32-bit Systemsmsrc_csaf
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722
BehobenWindows 10 Version 1607 for x64-based Systemsmsrc_csaf
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722
BehobenWindows 10 Version 1809 for 32-bit Systemsmsrc_csaf
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723
BehobenWindows 10 Version 1809 for x64-based Systemsmsrc_csaf
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723
BehobenWindows 10 Version 21H2 for 32-bit Systemsmsrc_csaf
10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
BehobenWindows 10 Version 21H2 for ARM64-based Systemsmsrc_csaf
10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
BehobenWindows 10 Version 21H2 for x64-based Systemsmsrc_csaf
10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
BehobenWindows 10 Version 22H2 for 32-bit Systemsmsrc_csaf
10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
BehobenWindows 10 Version 22H2 for ARM64-based Systemsmsrc_csaf
10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
BehobenWindows 10 Version 22H2 for x64-based Systemsmsrc_csaf
10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
BehobenWindows 11 Version 23H2 for ARM64-based Systemsmsrc_csaf
10.0.22631.6491:Security Update:https://support.microsoft.com/help/5073455
https://support.microsoft.com/help/5073455
BehobenWindows 11 Version 23H2 for x64-based Systemsmsrc_csaf
10.0.22631.6491:Security Update:https://support.microsoft.com/help/5073455
https://support.microsoft.com/help/5073455
BehobenWindows 11 Version 24H2 for ARM64-based Systemsmsrc_csaf
10.0.26100.7623:Security Update:https://support.microsoft.com/help/5074109
https://support.microsoft.com/help/5074109
BehobenWindows 11 Version 24H2 for x64-based Systemsmsrc_csaf
10.0.26100.7623:Security Update:https://support.microsoft.com/help/5074109
https://support.microsoft.com/help/5074109
BehobenWindows 11 Version 25H2 for ARM64-based Systemsmsrc_csaf
10.0.26200.7623:Security Update:https://support.microsoft.com/help/5074109
https://support.microsoft.com/help/5074109
BehobenWindows 11 Version 25H2 for x64-based Systemsmsrc_csaf
10.0.26200.7623:Security Update:https://support.microsoft.com/help/5074109
https://support.microsoft.com/help/5074109
BehobenWindows Server 2012msrc_csaf
6.2.9200.25868:Monthly Rollup:https://support.microsoft.com/help/5073698
https://support.microsoft.com/help/5073698
BehobenWindows Server 2012 (Server Core installation)msrc_csaf
6.2.9200.25868:Monthly Rollup:https://support.microsoft.com/help/5073698
https://support.microsoft.com/help/5073698
BehobenWindows Server 2012 R2msrc_csaf
6.3.9600.22968:Monthly Rollup:https://support.microsoft.com/help/5073696
https://support.microsoft.com/help/5073696
BehobenWindows Server 2012 R2 (Server Core installation)msrc_csaf
6.3.9600.22968:Monthly Rollup:https://support.microsoft.com/help/5073696
https://support.microsoft.com/help/5073696
BehobenWindows Server 2016msrc_csaf
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722
BehobenWindows Server 2016 (Server Core installation)msrc_csaf
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722
BehobenWindows Server 2019msrc_csaf
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723
BehobenWindows Server 2019 (Server Core installation)msrc_csaf
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723
BehobenWindows Server 2022msrc_csaf
10.0.20348.4648:Security Update:https://support.microsoft.com/help/5073457
https://support.microsoft.com/help/5073457
BehobenWindows Server 2022 (Server Core installation)msrc_csaf
10.0.20348.4648:Security Update:https://support.microsoft.com/help/5073457
https://support.microsoft.com/help/5073457
BehobenWindows Server 2022, 23H2 Edition (Server Core installation)msrc_csaf
10.0.25398.2092:Security Update:https://support.microsoft.com/help/5073450
https://support.microsoft.com/help/5073450
BehobenWindows Server 2025msrc_csaf
10.0.26100.32230:Security Update:https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da
https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da
BehobenWindows Server 2025 (Server Core installation)msrc_csaf
10.0.26100.32230:Security Update:https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da
https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

6.4

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen

v3.16.4mediumAV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.16.4mediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.16.4mediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USAusnutzbarkeit 0.5 · Auswirkung 5.9

v3.15.9mediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.16.4mediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · NCSC-NL NL

v3.16.4mediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

SSVC

Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-1329USCWE-1329USCWE-1329US

betroffene Produkte (181)

Betroffene Produkte und Versionsbereiche.

Hitachi Storagealle Versionencert_bundDEcpe:/h:hitachi:storage:-
Microsoft Windows 10 Version 1607alle Versionencert_bundDEcpe:/o:microsoft:windows_10:version_1607
Microsoft Windows 10 Version 1809alle Versionencert_bundDEcpe:/o:microsoft:windows_10:version_1809
Microsoft Windows 10 Version 21H2alle Versionencert_bundDEcpe:/o:microsoft:windows_10:version_21h2
Microsoft Windows 10 Version 22H2alle Versionencert_bundDEcpe:/o:microsoft:windows_10:version_22h2
Microsoft Windows 11 Version 23H2alle Versionencert_bundDEcpe:/o:microsoft:windows_11:version_23h2
Microsoft Windows 11 Version 24H2alle Versionencert_bundDEcpe:/o:microsoft:windows_11:version_24h2
Microsoft Windows 11 Windows Terminalalle Versionencert_bundDEcpe:/o:microsoft:windows_11:windows_terminal
Microsoft Windows Server 2008 R2 SP1alle Versionencert_bundDEcpe:/o:microsoft:windows_server:2008_r2_sp1
Microsoft Windows Server 2008 SP2alle Versionencert_bundDEcpe:/o:microsoft:windows_server:2008_sp2
Microsoft Windows Server 2012alle Versionencert_bundDEcpe:/o:microsoft:windows_server_2012:-
Microsoft Windows Server 2012 R2alle Versionencert_bundDEcpe:/o:microsoft:windows_server_2012_r2:-
Microsoft Windows Server 2016alle Versionencert_bundDEcpe:/o:microsoft:windows_server_2016:-
Microsoft Windows Server 2019alle Versionencert_bundDEcpe:/o:microsoft:windows_server_2019:-
Microsoft Windows Server 2022alle Versionencert_bundDEcpe:/o:microsoft:windows_server_2022:-
Microsoft Windows Server 2022 23H2 Editionalle Versionencert_bundDEcpe:/o:microsoft:windows_server_2022:23h2_edition
Microsoft Windows Server 2025alle Versionencert_bundDEcpe:/o:microsoft:windows_server_2025:-
Microsoft Windows 10 Version 160710.0.14393.0 → 10.0.14393.8783enisa_euvdEU
Microsoft Windows 10 Version 180910.0.17763.0 → 10.0.17763.8276enisa_euvdEU
Microsoft Windows 10 Version 21H210.0.19044.0 → 10.0.19044.6809enisa_euvdEU

20 von 181 angezeigt

Advisories (4)

Hersteller- und Ökosystem-Meldungen dazu.

NCSC-2026-0007Kwetsbaarheden verholpen in Microsoft WindowsNL2026-01-13csaf · ncsc_nlNL
Microsoft heeft kwetsbaarheden verholpen in Windows
WID-SEC-W-2026-0083Microsoft Windows : Mehrere SchwachstellenDeutsch2026-01-13csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows und Microsoft Windows Server ausnutzen,, um erweiterte Privilegien, einschließlich Benutzer- und Administratorrechten, zu erlangen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand zu verursachen und Daten zu manipulieren.
msrc_CVE-2026-21265Secure Boot Certificate Expiration Security Feature Bypass Vulnerability2026-01-13csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
JVNDB-2026-004359JVN iPedia advisory JVNDB-2026-0043592026-02-20vendor · jvndbJP

auch bekannt als (4)

Weitere Namen und Kennungen dieser Entität.

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvd enisa_euvd fstec_bdu cert_bund ncsc_nl msrc_csaf jvndb NVD CVE.org MITRE

veröffentlicht 2026-01-13geändert 2026-07-30

Referenzen (3)

Externe Belege — Patches, Meldungen, Analysen.

scry

Angreifer nutzen Schwachstellen wie diese gegen im Internet exponierte Dienste aus. Sehen Sie mit einem kostenlosen Passiv-Scan, was exponiert ist.

Kostenloser Scan