Secure Boot Certificate Expiration Security Feature Bypass Vulnerability
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-21265US | — | — | ||
Windows Secure Boot stores Microsoft certificates in the UEFI KEK and DB. These original certificates are approaching expiration, and devices containing affected certificate versio… | ||||
references
External citations — patches, advisories, analysis.
- CVE-2026-21265 Secure Boot Certificate Expiration Security Feature Bypass Vulnerability - CSAFself
- CVE-2026-21265 Secure Boot Certificate Expiration Security Feature Bypass Vulnerability - HTMLself
- Microsoft Support Lifecycleexternal
- Common Vulnerability Scoring Systemexternal
- Microsoft Exploitability Indexexternal
remediations (29)
- FixedWindows 10 Version 1607 for 32-bit Systems
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722 - FixedWindows 10 Version 1607 for x64-based Systems
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722 - FixedWindows 10 Version 1809 for 32-bit Systems
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723 - FixedWindows 10 Version 1809 for x64-based Systems
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723 - FixedWindows 10 Version 21H2 for 32-bit Systems
10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724 - FixedWindows 10 Version 21H2 for ARM64-based Systems
10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724 - FixedWindows 10 Version 21H2 for x64-based Systems
10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724 - FixedWindows 10 Version 22H2 for 32-bit Systems
10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724 - FixedWindows 10 Version 22H2 for ARM64-based Systems
10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724 - FixedWindows 10 Version 22H2 for x64-based Systems
10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724 - FixedWindows 11 Version 23H2 for ARM64-based Systems
10.0.22631.6491:Security Update:https://support.microsoft.com/help/5073455
https://support.microsoft.com/help/5073455 - FixedWindows 11 Version 23H2 for x64-based Systems
10.0.22631.6491:Security Update:https://support.microsoft.com/help/5073455
https://support.microsoft.com/help/5073455 - FixedWindows 11 Version 24H2 for ARM64-based Systems
10.0.26100.7623:Security Update:https://support.microsoft.com/help/5074109
https://support.microsoft.com/help/5074109 - FixedWindows 11 Version 24H2 for x64-based Systems
10.0.26100.7623:Security Update:https://support.microsoft.com/help/5074109
https://support.microsoft.com/help/5074109 - FixedWindows 11 Version 25H2 for ARM64-based Systems
10.0.26200.7623:Security Update:https://support.microsoft.com/help/5074109
https://support.microsoft.com/help/5074109 - FixedWindows 11 Version 25H2 for x64-based Systems
10.0.26200.7623:Security Update:https://support.microsoft.com/help/5074109
https://support.microsoft.com/help/5074109 - FixedWindows Server 2012
6.2.9200.25868:Monthly Rollup:https://support.microsoft.com/help/5073698
https://support.microsoft.com/help/5073698 - FixedWindows Server 2012 (Server Core installation)
6.2.9200.25868:Monthly Rollup:https://support.microsoft.com/help/5073698
https://support.microsoft.com/help/5073698 - FixedWindows Server 2012 R2
6.3.9600.22968:Monthly Rollup:https://support.microsoft.com/help/5073696
https://support.microsoft.com/help/5073696 - FixedWindows Server 2012 R2 (Server Core installation)
6.3.9600.22968:Monthly Rollup:https://support.microsoft.com/help/5073696
https://support.microsoft.com/help/5073696 - FixedWindows Server 2016
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722 - FixedWindows Server 2016 (Server Core installation)
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722 - FixedWindows Server 2019
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723 - FixedWindows Server 2019 (Server Core installation)
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723 - FixedWindows Server 2022
10.0.20348.4648:Security Update:https://support.microsoft.com/help/5073457
https://support.microsoft.com/help/5073457 - FixedWindows Server 2022 (Server Core installation)
10.0.20348.4648:Security Update:https://support.microsoft.com/help/5073457
https://support.microsoft.com/help/5073457 - FixedWindows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.2092:Security Update:https://support.microsoft.com/help/5073450
https://support.microsoft.com/help/5073450 - FixedWindows Server 2025
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 - FixedWindows Server 2025 (Server Core installation)
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
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