AddressSanitizer (or ASan) is an open source programming tool that detects memory corruption bugs such as buffer overflows or accesses to a dangling pointer (use-after-free). AddressSanitizer is based on compiler instrumentation and directly mapped shadow memory. AddressSanitizer is currently implemented in Clang (starting from version 3.1), GCC (starting from version 4.8), Xcode (starting from version 7.0) and MSVC (widely available starting from version 16.9). On average, the instrumentation increases processing time by about 73% and memory usage by 240%.