CVE-2017-20004: Rust-Lang Rust

Medium severity, CVSS 5.9. EPSS: 0.8% chance of exploitation in the next 30 days.

In the standard library in Rust before 1.19.0, there is a synchronization problem in the MutexGuard object. MutexGuards can be used across threads with any types, allowing for memory safety issues through race conditions.

Affected products

• Rust-Lang Rust: before 1.19.0 (fixed in 1.19.0)

Published 2021-04-14. Last modified 2026-06-17.