What is CVE-2021-45704?

CVE-2021-45704 is a high-severity vulnerability in Metrics-Util Project, 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-2021-45704?

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

Buffer overflow in Metrics-Util Project

CVE-2021-45704

An issue was discovered in the metrics-util crate before 0.7.0 for Rust. There is a data race and memory corruption because AtomicBucket<T> unconditionally implements the Send and Sync traits.

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: 0.007 (53.1th percentile), scored 2026-10-06.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Metrics-Util Project

Weakness classification (CWE)

References

rustsec.org/advisories/RUSTSEC-2021-0113.html (Third Party Advisory)
raw.githubusercontent.com/rustsec/advisory-db/main/crates/metrics-util/RUSTSEC-… (Third Party Advisory)

Frequently asked questions

What is CVE-2021-45704?: CVE-2021-45704 is a high-severity vulnerability in Metrics-Util Project, 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-2021-45704?: High severity. CVSS v3 base score is 8.1 out of 10.