DXE, or Driver Execution Environment, is a phase of the UEFI startup process. During it, firmware drivers run, initialize devices, and provide services needed for later boot stages, before the operating system loads.
Because DXE code runs with high privilege before normal operating-system defenses are active, a flaw in a driver can threaten the integrity or availability of the boot process. Network-boot components such as a PXE driver may handle traffic during this phase, making bugs in that path especially important to assess. Defenders should check whether their device firmware includes affected DXE drivers, apply vendor-validated firmware updates, and disable PXE when it is not needed.