No exploitation reportedFix available

CVE-2021-45687

Q: Is CVE-2021-45687 actively exploited?

Active exploitation of CVE-2021-45687 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-45687?

CVE-2021-45687 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-12-27
Fixed in9.1.1
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2021-12-2700:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-45687?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-45687?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Raw-cpuid project raw-cpuid

Branch	Affected	Fixed in	Source
9.1	< 9.1.1	9.1.1	NVD
9.1	≥ 3.1.0, < 9.1.1	9.1.1	OSV
9.1	≥ 3.1.1-0, < 9.1.1	9.1.1	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Raw-cpuid project raw-cpuid to 9.1.1

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score1.2 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2021-12-27
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-45687?

Is CVE-2021-45687 actively exploited?

Active exploitation of CVE-2021-45687 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-45687?

CVE-2021-45687 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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