Описание
Secure Boot Certificate Expiration Security Feature Bypass Vulnerability
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.
FAQ
What kind of security feature could be bypassed by successfully exploiting this vulnerability?
An attacker who successfully exploited this vulnerability could bypass Secure Boot.
Where can I find more information about Windows Secure Boot certificate expiration?
To understand more about Windows Secure Boot and the importance of taking immediate action to renew your certificates see Windows Secure Boot certificate expiration and CA updates.
See also the following links for the actions you need to take based on your Windows device:
- Windows devices for home users, businesses, and schools with Microsoft-managed updates
- Windows devices with IT-managed updates
- Secure Boot FAQs can be found here: Secure Boot FAQs
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to have a deep understanding of the system and the ability to manipulate its components to trigger a specific condition. Successful exploitation is not guaranteed and depends on a combination of factors that may include the environment, system configuration, and the presence of additional security measures.
Обновления
| Продукт | Статья | Обновление |
|---|---|---|
| Windows Server 2012 | ||
| Windows Server 2012 (Server Core installation) | ||
| Windows Server 2012 R2 | ||
| Windows Server 2012 R2 (Server Core installation) | ||
| Windows Server 2016 | ||
| Windows 10 Version 1607 for 32-bit Systems | ||
| Windows 10 Version 1607 for x64-based Systems | ||
| Windows Server 2016 (Server Core installation) | ||
| Windows 10 Version 1809 for 32-bit Systems | ||
| Windows 10 Version 1809 for x64-based Systems |
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Возможность эксплуатации
Publicly Disclosed
Exploited
Latest Software Release
EPSS
6.4 Medium
CVSS3
Связанные уязвимости
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 ...
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 Windo
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 Wi...
Уязвимость реализации протокола безопасной загрузки Secure Boot операционных систем Windows, позволяющая нарушителю обойти существующие ограничения безопасности
EPSS
6.4 Medium
CVSS3