CVE-2021-29930: 
Rust vulnerability analysis and mitigation

The vulnerability (CVE-2021-29930) was discovered in the arenavec crate through version 2021-01-12 for Rust. The issue involves a potential drop of uninitialized memory that can occur when a panic happens in T::default(). The vulnerability was reported on January 12, 2021, and officially issued on March 7, 2021 (RustSec Advisory).

The vulnerability stems from inadequate panic safety mechanisms in the arenavec crate. When T::default() panics during execution, it leads to dropping uninitialized T when invoked from common::Slice::::new(). The severity of this vulnerability is rated as HIGH with a CVSS v3.1 base score of 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) (RustSec Advisory).

The vulnerability can cause memory corruption in heap memory when triggered. This occurs due to the improper handling of panics in user-provided functions T::default() and T::drop(), which can lead to memory safety violations (RustSec Advisory).

As of the advisory date, there are no patched versions available for this vulnerability. The issue affects all versions of the arenavec crate through 2021-01-12 (RustSec Advisory).