One of the core claims of the language is data race safety because in safe rust, no memory location can be written by two or more owners at the same time. (see https://doc.rust-lang.org/nomicon/races.html for a more detailed discussion) Consequently, the kind of memory corruptions that this vulnerability seems to exploit are not possible in safe rust. Now, we don't know if a hypothetical rust-based apache implementation would have reached for unsafe in this context or done any other wild thing, but it's fair to assume that the likelihood of an exploitable RCE through memory corruption trends towards zero in programs written in Rust.