RUSTSEC-2021-0064: 
Rust vulnerability analysis and mitigation

The RUSTSEC-2021-0064 advisory pertains to the cpuid-bool crate, which was marked as unmaintained on May 6, 2021. The crate has been renamed to cpufeatures as part of a broader initiative to support additional CPU architectures beyond x86, particularly ARM platforms (RustCrypto Utils).

The change involved renaming the cpuid-bool crate to cpufeatures to accommodate a more general approach to CPU feature detection, particularly for supporting ARM architectures alongside existing x86 support. This was implemented through a pull request that reorganized the codebase to better handle multi-architecture support (RustCrypto Utils).

The impact was primarily on dependency management for projects using the cpuid-bool crate. As the original crate was marked as unmaintained, projects needed to update their dependencies to use the new cpufeatures crate to continue receiving updates and support (RustCrypto Utils).

Users are advised to migrate from the cpuid-bool crate to the new cpufeatures crate. The cpufeatures crate is the direct replacement and continues to be maintained with expanded functionality. No further releases will be made to the original cpuid-bool crate (RustCrypto Utils).

The change was well-received by the community, with multiple projects updating their dependencies to accommodate the new crate name. Various projects including Wasmtime, Tari, and others have addressed this advisory in their codebases by either updating their dependencies or acknowledging the need to transition (RustCrypto Utils).