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CVE-2021-30853

MediumPublished

This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.6. A malicious application may bypass Gatekeeper checks.

Published: Aug 24, 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:N/I:H/A:N

EPSS probability estimate

6.9%

Low · next 30 days

Percentile: 93.9%
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 11.6. A malicious application may bypass Gatekeeper checks.

Sources

CVE-2021-30853PoC
Proof-of-concept script that demonstrates bypassing macOS Gatekeeper, notarization, and XProtect checks by exploiting CVE-2021-30853, allowing execution of arbitrary shell payloads without user prompts.

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