CVE-2021-45704: An issue was discovered in the metrics-util crate before 0.7.0 for Rust

Q: How do I fix CVE-2021-45704?

metrics-util: upgrade to 0.7.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-45704 being exploited?

CVE-2021-45704 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-45704 affect?

CVE-2021-45704 affects metrics-util. Severity is high (CVSS 8.1). 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 unconditionally implements the Send and Sync traits.

This month

HIGH 8.1REMOTEUPGRADE

CVE-2021-45704 is a high-severity flaw (CVSS 8.1) affecting metrics-util. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-362, CWE-787
Published	2021-12-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: metrics-util project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-27 00:15 UTCPublished CVE record published
2026-06-17 04:13 UTCUpdated Record last modified

metrics-util project metrics-util UPGRADE

Affected: < 0.7.0

Fixed in: 0.7.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy metrics-util || rpm -q metrics-util || metrics-util --version

2. UPGRADE to 0.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade metrics-util

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade metrics-util

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-45704?

metrics-util: upgrade to 0.7.0. Exact commands for each OS are on this page.

Is CVE-2021-45704 being exploited?

CVE-2021-45704 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-45704 affect?

CVE-2021-45704 affects metrics-util. Severity is high (CVSS 8.1). 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 urgent is CVE-2021-45704?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

References

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