Resilient multi-variant execution verification

Generally discussed herein are systems, apparatuses, and methods for cyber resiliency. An apparatus can include one or more memory devices including a plurality of instruction sets corresponding to respective application variants stored thereon, one of the application variants including an unmodified version of an application, and one of the application variants including a modified version of the application including the application altered to be resistant to a specified type of cyberattack, processing circuitry to execute the application variants based on a same input, and generate an output, and a monitor to compare output from each of the application variants, and in response to detecting that the output from an application variant of the application variants is not equal to the output from other application variants of the application variants executing a time delayed version of the application variants or restoring the application variants to a known good operating state.