Field Programmable Gate Arrays (FPGAs) are flexibly programmable computer chips that are considered very secure components in many applications. Scientists have now discovered that a critical vulnerability is hidden in these chips. Attackers can gain complete control over the chips and their functionalities via the vulnerability. Since the bug is integrated into the hardware, the security risk can only be removed by replacing the chips. The manufacturer of the FPGAs has been informed by the researchers and has already reacted.