CVE-2021-45687: An issue was discovered in the raw-cpuid crate before 9.1.1 for Rust

Q: How do I fix CVE-2021-45687?

raw-cpuid: upgrade to 9.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-45687 being exploited?

CVE-2021-45687 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-2021-45687 affect?

CVE-2021-45687 affects raw-cpuid. Severity is critical (CVSS 9.8). An issue was discovered in the raw-cpuid crate before 9.1.1 for Rust. If the serialize feature is used (which is not the the default), a Deserialize operation may lack sufficient validation, leading to memory corruption or a panic.

Q: How urgent is CVE-2021-45687?

Priority 56/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-45687 is a critical-severity flaw (CVSS 9.8) affecting raw-cpuid. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the raw-cpuid crate before 9.1.1 for Rust. If the serialize feature is used (which is not the the default), a Deserialize operation may lack sufficient validation, leading to memory corruption or a panic.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-20
Published	2021-12-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: raw-cpuid 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

raw-cpuid project raw-cpuid UPGRADE

Affected: < 9.1.1

Fixed in: 9.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy raw-cpuid || rpm -q raw-cpuid || raw-cpuid --version

2. UPGRADE to 9.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade raw-cpuid

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade raw-cpuid

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-2021-45687?

raw-cpuid: upgrade to 9.1.1. Exact commands for each OS are on this page.

Is CVE-2021-45687 being exploited?

CVE-2021-45687 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-2021-45687 affect?

CVE-2021-45687 affects raw-cpuid. Severity is critical (CVSS 9.8). An issue was discovered in the raw-cpuid crate before 9.1.1 for Rust. If the serialize feature is used (which is not the the default), a Deserialize operation may lack sufficient validation, leading to memory corruption or a panic.

How urgent is CVE-2021-45687?

Priority 56/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-26307 MEDIUM 5.5 UPGRADE An issue was discovered in the raw-cpuid crate before 9.0.0 for Rust
CVE-2021-26306 HIGH 7.5 UPGRADE An issue was discovered in the raw-cpuid crate before 9.0.0 for Rust

References

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