Cybersecurity researchers disclose a chain of vulnerabilities affecting the BIOSConnect feature within Dell Client BIOS that could be abused by a privileged network adversary to gain arbitrary code execution at the BIOS/UEFI level of the affected device. The flaws affect 128 Dell models spanning across consumer and business laptops, desktops, and tablets, totalling an estimated 30 million individual devices. The weaknesses also impact computers that have Secure Boot enabled, a security feature designed to prevent rootkits from being installed at boot time in memory.
Source: https://thehackernews.com/2021/06/bios-disconnect-new-high-severity-flaws.html