In the 2000s and 2010s, a sharper focus on security and performance reshaped the CRT again. Memory-safety bugs in native code became a leading attack vector. Microsoft introduced compiler-driven checks (like /GS stack cookies and later Control Flow Guard) and runtime checks (secure CRT functions that reject dangerous inputs). The CRT’s allocator and I/O paths were optimized for multicore processors and modern storage. New APIs and helpers for safe string handling, secure environment functions, and compatibility shims were added.
: Smaller executable size; updates to the DLL benefit the app automatically. microsoft c runtime