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CVE-2021-30731

MediumPublished

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...

Published: Sep 8, 2021
Updated: Aug 3, 2024
Assigning CNA: apple
Evidence observed: Aug 25, 2026

Primary CVSS

5.5/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 47.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

WebcamViewerPoC
Proof-of-concept demonstrating CVE-2021-30731, allowing unauthorized USB webcam access on macOS. Built with libuvc, it previews connected webcams on vulnerable systems.

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