CVE-2026-21265

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...

CVE-2026-21265

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...

CVE-2026-21265

CVE-2026-21265 describes a Secure Boot bypass tied to expiration of Microsoft root certificates in the UEFI KEK/DB chain. Affected certificates include KEK CA 2011 (expires 2026-06-24), UEFI CA 2011 (expires 2026-06-27), and Windows Production PCA 2011 (expires 2026-10-19). The vulnerability aris...