CVE-2021-30731

MEDIUMNVD 5.55.5—

5.5

This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Catalina. An unprivileged application may be able to capture USB devices.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 49.5%
KEV: Not listed

Published

September 8, 2021

Last Modified

November 21, 2024

References (4)

product-security@applehttps://support.apple.com/en-us/HT212529
product-security@applehttps://support.apple.com/en-us/HT212600
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212529
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212600

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-30731?

CVE-2021-30731 is a medium vulnerability published on September 8, 2021. This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Catalina. An unprivileged application may be able to capture USB devices.

When was CVE-2021-30731 disclosed?

CVE-2021-30731 was first published in the National Vulnerability Database on September 8, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-30731 actively exploited?

CVE-2021-30731 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 49.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-30731?

CVE-2021-30731 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-30731?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30731, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-30731

📅 Published

🔄 Last Modified

🔗 References (4)