Critical UEFI Firmware Flaw Exposes Most Servers and Data Centers to Code Execution Attacks

A critical vulnerability in UEFI firmware—the foundational code that boots nearly every modern server—could allow attackers to execute malicious code before the operating system even loads, according to new research. The flaw affects firmware used by most major server vendors and is present in data centers worldwide, making it one of the most widespread firmware security issues discovered to date. Because UEFI sits below the OS and security software, attacks exploiting this flaw can persist undetected and survive reboots, granting deep control over the machine. Security experts warn that the complexity of patching firmware across thousands of servers, combined with the need for downtime, means many systems will remain exposed for months or years. The vulnerability underscores the growing risk of supply-chain and low-level attacks as threat actors shift focus to pre-boot environments. As enterprises accelerate cloud adoption and edge deployments, securing the firmware layer has become a critical priority for IT and security teams.