How severe is CVE-2021-45704?

CVE-2021-45704 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-45704 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45704?

CVE-2021-45704 affects Metrics-util Project Metrics-util. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45704?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-45704 published?

CVE-2021-45704 was published on 2021-12-27 and last updated on 2026-06-17.

CVE-2021-45704

CVE-2021-45704 is a high-severity vulnerability in Metrics-util Project Metrics-util with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-362.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-362
Affected product: Metrics-util Project Metrics-util
Published: 2021-12-27
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-45704?: CVE-2021-45704 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-45704 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45704?: CVE-2021-45704 affects Metrics-util Project Metrics-util. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45704?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-45704 published?: CVE-2021-45704 was published on 2021-12-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:metrics-util_project:metrics-util:*:*:*:*:*:rust:*:*

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