In an example, an apparatus compatible with a unified extensible firmware interface (UEFI) system includes a processor resource and a computer-readable storage device with a set of instructions stored thereon. In that example, the instructions are executable to cause the UEFI system to verify an integrity status of a script file and an authenticity status of the script file, analyze contents of the script file in response to a determination that the script is authentic, establish a threshold on execution of the script file based on the analysis of the contents, and execute a control program concurrent with execution of the script to implement the threshold.