How ASLR Makes Memory Addresses Unpredictable to Thwart Cyberattacks

Address Space Layout Randomization (ASLR) is a security technique used by operating systems to randomize where key regions of a program's memory are loaded each time it runs. Many cyberattacks rely on knowing the exact memory addresses of code, the stack, heap, or shared libraries to turn a vulnerability into a controlled exploit. By shuffling these locations on every execution, ASLR forces attackers to guess where critical memory regions reside, making reliable exploitation significantly harder. Each running process operates within its own virtual address space, and ASLR alters the base addresses of its segments — such as the code, stack, and shared libraries — at load time. Importantly, ASLR does not fix the underlying software bug; it only adds unpredictability that raises the cost and complexity of successful exploitation.