I don't think there's a language barrier here. I'm fluent in English, and I know what a shim is, both IRL and in the software world. I've just not run into it in a boot loader context before. And I'm not really knowledgeable when it comes to secure boot, either. Just trying to understand. 🙂

Are you sure that's a good phrasing though, "that breaks into your UEFI"?

A shim is usually something that you use to add or modify functionality by interception, right? Like a middle-ware, almost. So these old shims, are they responsible for functionality that directly has to do with Secure Boot, or something else?

If so, they are broken — i.e. not fulfilling their purpose.

If something else, they are not broken. They are just breaking something else, or making it vulnerable.

Am I making sense? Does it not make sense? Because after all, I don't know much about the details of the subject matter. 😁