A comprehensive empirical study evaluates automated C-to-Rust refactoring tools (C2Rust-analyze, CROWN, C2SaferRust, FLOURINE) on 116 C programs with memory security bugs. Results show that while these tools reduce unsafe Rust code, they fail to reliably eliminate memory security vulnerabilities: 342 programs fail compilation, 177 inherit original C bugs, and 77 introduce new Rust bugs.