boot security

An authentication bypass in GRUB2 tracked as CVE-2023-4001 lets an attacker with physical access to a machine defeat GRUB’s boot-time password protection by tricking the bootloader into loading a configuration that doesn’t contain the password settings. The defect arises from how GRUB searches...

A subtle overflow in a widely used UEFI helper — the shim bootloader’s handle_image() routine — reappeared in headlines after CVE-2022-28737 was published, and Microsoft’s short advisory that “Azure Linux includes this open‑source library and is therefore potentially affected” has prompted a...

Microsoft’s January Patch Tuesday includes a high-priority update that refreshes expiring Secure Boot certificates on Windows devices — a preventative, must-install fix that closes a narrow but critical window attackers could use to install persistent bootkits before the OS loads. rview UEFI...

A new GRUB2 vulnerability, tracked as CVE-2025-61661, permits an out‑of‑bounds write during USB string handling that can crash the bootloader when a maliciously‑crafted USB device is present during boot, producing a denial‑of‑service and a limited risk of data corruption; the defect is narrow...

A recently disclosed use‑after‑free defect in the GRUB2 bootloader — tracked as CVE‑2025‑61662 — stems from a missing unregister call in the gettext module and can lead to grub crashes and denial‑of‑service on affected systems. Background / Overview GRUB (GRand Unified Bootloader) is the de...

Microsoft confirmed on October 14, 2025 that BitLocker — the Windows full‑disk encryption technology relied on by millions of personal and enterprise devices — is affected by multiple security‑feature bypass vulnerabilities that can be exploited with only brief physical access to a machine. The...

The discovery and public disclosure of CVE‑2025‑47827 — a Secure Boot bypass in IGEL OS versions before 11 — has forced a re‑examination of how the boot‑time trust chain is implemented in thin‑client deployments, and it has produced immediate operational consequences for administrators who still...

Microsoft’s advisory for CVE-2025-55682 describes a BitLocker vulnerability that allows an attacker with physical access to bypass a BitLocker security control by exploiting improper enforcement of a behavioral workflow during early boot or recovery, and administrators should treat the vendor...

Microsoft has confirmed a Windows BitLocker security feature bypass tracked as CVE-2025-55332, and the advisory — backed by third‑party aggregators — describes an issue that allows an attacker with physical access to influence BitLocker’s boot or recovery decision logic and bypass protections...

Below is a long-form feature article you can use on WindowsForum.com. It summarizes ANSSI’s guidance (the “Start‑up security for Windows servers” publication you linked), validates and expands that guidance against Microsoft and CIS recommendations, and gives a practical, step‑by‑step playbook...

Microsoft’s security update guide lists CVE‑2025‑54911 as a use‑after‑free defect in Windows BitLocker that can be triggered by an authorized local user to elevate privileges on affected machines, creating a high‑impact local elevation‑of‑privilege risk that administrators must treat as urgent...

Microsoft has warned that the cryptographic roots underpinning UEFI Secure Boot on Windows devices will begin to expire in June 2026, forcing a global certificate update that every IT team and many end users must plan for now to avoid boot-level insecurities and loss of updateability. Background...

Microsoft’s guidance on Secure Boot key creation and management is an urgent operational playbook for every Windows administrator: a coordinated certificate rollover is underway that replaces legacy 2011 UEFI/CA trust anchors with new 2023 CA families, and failure to prepare — especially on...

Microsoft released an out‑of‑band update on August 19, 2025—KB5066189—for Windows 11 devices on the 22621 and 22631 build families (OS Builds 22621.5771 and 22631.5771). The package is an optional, non‑security rollup that patches a regression introduced by the August 2025 monthly updates...

A sweeping change in Battlefield 2042’s anti-cheat policy has set off a wave of confusion and urgency among PC gamers. With update v8.8.0, Secure Boot—a UEFI firmware feature typically reserved for thwarting malware at the bare-metal level—has become a non-negotiable prerequisite for anyone...

The highly anticipated launch of Battlefield 6 delivers a cutting-edge gaming experience to PC players, but it also brings a new layer of security requirements—chief among them, the need for Secure Boot to be enabled on Windows 10 and Windows 11 systems. As EA’s Javelin anti-cheat technology...

Upgrading to Windows 11 promises a host of modern features and enhanced security, but for many users, one hurdle stands between them and a smooth installation: Secure Boot. As part of Microsoft's system requirements introduced for Windows 11, Secure Boot has transformed from an obscure UEFI...

Here is a summary of KB5062839: Setup Dynamic Update for Windows 11, version 24H2 and Windows Server 2025 (Released July 22, 2025): Overview This update makes improvements to Windows setup binaries or any files used for feature updates in: Windows 11, version 24H2 (all editions, including SE...

For users continuing to rely on Windows 11, a critical new vulnerability affecting Secure Boot casts fresh doubts over the operating system's security posture. Secure Boot has long been marketed as a foundational defense—ensuring that a device loads only trusted, signed code during the initial...

Microsoft has released the KB5062688 Safe OS Dynamic Update for Windows 11, version 24H2, and Windows Server 2025 on July 8, 2025. This update enhances the Windows Recovery Environment (WinRE), ensuring a more secure and reliable recovery process. Key Highlights: Windows Secure Boot Certificate...