CVE-2017-20004

CVE-2017-20004 describes a synchronization vulnerability within the MutexGuard object in Rust’s standard library, affecting versions prior to 1.19.0. This flaw allows MutexGuards to be used across threads with arbitrary types, creating race conditions that lead to memory safety issues. Rated as Medium severity (CVSS 5.9), an attacker could exploit this remotely with high attack complexity to achieve high integrity impact, though confidentiality and availability are not directly affected. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.