Rust by default will not allow you to make certain kinds of errora, which is great. But if you are doing something advanced, down at the hardware level, you might need to disable those defaults in order to write the code you need. This is what people mean by “unsafe” – lacking the normal memory safeguards.
With careful coding, “unsafe rust” or normal C, for that matter, can be free of bugs and safe. But if programmers make a mistake, vulnerabilities can creep in more easily in the unsafe sections.
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