CVE-2026-21265
Estado: AnalizadaMedia (6.4)—
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.
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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.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 6.4
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 1.07%
- Percentil entre todas las CVEs puntuadas: 64
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (13)
Microsoft — Windows 10 1607Microsoft — Windows 10 1809Microsoft — Windows 10 21h2Microsoft — Windows 10 22h2Microsoft — Windows 11 23h2Microsoft — Windows 11 24h2Microsoft — Windows 11 25h2Microsoft — Windows Server 2012Microsoft — Windows Server 2016Microsoft — Windows Server 2019Microsoft — Windows Server 2022Microsoft — Windows Server 2022 23h2Microsoft — Windows Server 2025
CWE
- CWE-1329
Referencias
JSON original (NVD)
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"value": "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.\nThe 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.\n\n\n\nCertificate Authority (CA)\nLocation\nPurpose\nExpiration Date\n\n\n\n\nMicrosoft Corporation KEK CA 2011\nKEK\nSigns updates to the DB and DBX\n06/24/2026\n\n\nMicrosoft Corporation UEFI CA 2011\nDB\nSigns 3rd party boot loaders, Option ROMs, etc.\n06/27/2026\n\n\nMicrosoft Windows Production PCA 2011\nDB\nSigns the Windows Boot Manager\n10/19/2026\n\n\n\nFor more information see this CVE and Windows Secure Boot certificate expiration and CA updates."
},
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"value": "Secure Boot de Windows almacena certificados de Microsoft en el KEK y DB de UEFI. Estos certificados originales están próximos a caducar, y los dispositivos que contienen versiones de certificados afectadas deben actualizarlos para mantener la funcionalidad de Secure Boot y evitar comprometer la seguridad al perder las correcciones de seguridad relacionadas con el gestor de arranque de Windows o Secure Boot.\nEl mecanismo de protección de actualización de certificados del sistema operativo se basa en componentes de firmware que podrían contener defectos, lo que puede hacer que las actualizaciones de confianza de los certificados fallen o se comporten de manera impredecible. Esto lleva a una posible interrupción de la cadena de confianza de Secure Boot y requiere una validación y un despliegue cuidadosos para restaurar las garantías de seguridad previstas.\n\nAutoridad de Certificación (CA)\nUbicación\nPropósito\nFecha de Vencimiento\n\nMicrosoft Corporation KEK CA 2011\nKEK\nFirma las actualizaciones de la DB y DBX\n24/06/2026\n\nMicrosoft Corporation UEFI CA 2011\nDB\nFirma cargadores de arranque de terceros, ROMs de opción, etc.\n27/06/2026\n\nMicrosoft Windows Production PCA 2011\nDB\nFirma el Gestor de Arranque de Windows\n19/10/2026\n\nPara más información, consulte este CVE y el vencimiento de los certificados de Secure Boot de Windows y las actualizaciones de CA."
}
],
"lastModified": "2026-07-30T21:17:13.597",
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