What is CVE-2021-45710?

CVE-2021-45710 is a high-severity vulnerability in Tokio, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 8.1/10. Published 2021-12-27.

How severe is CVE-2021-45710?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Tokio

CVE-2021-45710

An issue was discovered in the tokio crate before 1.8.4, and 1.9.x through 1.13.x before 1.13.1, for Rust. In certain circumstances involving a closed oneshot channel, there is a data race and memory corruption.

Vulnerability class: Race Condition

Published 2021-12-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (65.8th percentile), scored 2026-10-06.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: -0.000

Affected products

Tokio

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

rustsec.org/advisories/RUSTSEC-2021-0124.html (Patch, Third Party Advisory)
raw.githubusercontent.com/rustsec/advisory-db/main/crates/tokio/RUSTSEC-2021-01… (Third Party Advisory)

Frequently asked questions

What is CVE-2021-45710?: CVE-2021-45710 is a high-severity vulnerability in Tokio, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 8.1/10. Published 2021-12-27.
How severe is CVE-2021-45710?: High severity. CVSS v3 base score is 8.1 out of 10.