CVE-2026-21265

Katalog CVE

CVSS 6.4 · Medium EPSS 1,1%

Kerentanan Reliance on Component That is Not Updateable pada microsoft windows 10 1607, microsoft windows 10 1809 +11 lainnya. Skor CVSS 3.1 6.4 (Medium) menurut microsoft.com.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

13 Januari 2026

Terakhir diubah

30 Juli 2026

Status NVD

Analyzed

CVSS 3.1

6.4 (Medium), sumber microsoft.com
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-1329: Reliance on Component That is Not Updateable

EPSS (30 hari)

1,1% peluang dieksploitasi; lebih tinggi dari 64,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21265 advisory vendor