What’s Vulnerable › Vulnerabilities

CVE-2021-30766

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% 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-787

Description

An out-of-bounds write was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.5, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave. An application may be able to execute arbitrary code with kernel privileges.

Affected products

• macOS: from 10.14 through 10.14.5; from 10.15 through 10.15.6; 10.14.6, 10.14.6-security_update_2019-001, 10.14.6-security_update_2019-002, 10.14.6-security_update_2019-004, 10.14.6-security_update_2019-005, 10.14.6-security_update_2019-006 (+23)
• Apple macOS: from 11.0 before 11.5 — fixed in 11.5

How to fix

Upgrade to a fixed version: Apple macOS 11.5. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT212600
• https://support.apple.com/en-us/HT212602
• https://support.apple.com/en-us/HT212603
• https://support.apple.com/en-us/HT212600
• https://support.apple.com/en-us/HT212602
• https://support.apple.com/en-us/HT212603

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