What’s Vulnerable › Vulnerabilities

CVE-2021-30657: Apple macOS Unspecified Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 68.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-08 · updated 2026-06-17
• Weakness: CWE-862

Description

A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. A malicious application may bypass Gatekeeper checks. Apple is aware of a report that this issue may have been actively exploited..

Affected products

• macOS: from 10.15 through 10.15.5; 10.15.6, 10.15.6-supplemental_update, 10.15.7, 10.15.7-security_update_2020, 10.15.7-security_update_2020-001, 10.15.7-security_update_2020-005 (+2)
• Apple macOS: from 11.0 before 11.3 — fixed in 11.3

How to fix

Upgrade to a fixed version: Apple macOS 11.3. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT212325
• https://support.apple.com/en-us/HT212326
• https://support.apple.com/en-us/HT212325
• https://support.apple.com/en-us/HT212326
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30657

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