How severe is CVE-2021-26307?

CVE-2021-26307 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-26307 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26307?

CVE-2021-26307 affects Raw-cpuid Project Raw-cpuid. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26307?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-26307 published?

CVE-2021-26307 was published on 2021-01-29 and last updated on 2026-06-17.

CVE-2021-26307

CVE-2021-26307 is a medium-severity vulnerability in Raw-cpuid Project Raw-cpuid with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Raw-cpuid Project Raw-cpuid
Published: 2021-01-29
Last modified: 2026-06-17

Description

An issue was discovered in the raw-cpuid crate before 9.0.0 for Rust. It allows __cpuid_count() calls even if the processor does not support the CPUID instruction, which is unsound and causes a deterministic crash.

Frequently asked questions

What is CVE-2021-26307?: An issue was discovered in the raw-cpuid crate before 9.0.0 for Rust. It allows __cpuid_count() calls even if the processor does not support the CPUID instruction, which is unsound and causes a deterministic crash.
How severe is CVE-2021-26307?: CVE-2021-26307 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-26307 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26307?: CVE-2021-26307 affects Raw-cpuid Project Raw-cpuid. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26307?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26307 published?: CVE-2021-26307 was published on 2021-01-29 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2021-0013.html

Affected products (1)

cpe:2.3:a:raw-cpuid_project:raw-cpuid:*:*:*:*:*:rust:*:*

More vulnerabilities in Raw-cpuid Project Raw-cpuid

CVE-2021-45687 — 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…
CVE-2021-26306 — High (CVSS 7.5): An issue was discovered in the raw-cpuid crate before 9.0.0 for Rust. It has unsound transmute calls within as_string()…

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