What’s Vulnerable › Vulnerabilities

CVE-2021-30865

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-24 · updated 2026-06-17
• Weakness: CWE-125

Description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.6, Security Update 2021-005 Catalina. A malicious application may be able to execute arbitrary code with kernel privileges.

Affected products

• macOS: before 10.15.7; 10.15.7, 10.15.7-security_update_2020-001, 10.15.7-security_update_2021-001, 10.15.7-security_update_2021-002, 10.15.7-security_update_2021-003, 10.15.7-security_update_2021-004 (+1) — fixed in 10.15.7
• Apple macOS: from 11.0 before 11.6 — fixed in 11.6

How to fix

Upgrade to a fixed version: macOS 10.15.7; Apple macOS 11.6. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT212804
• https://support.apple.com/en-us/HT212805
• https://support.apple.com/en-us/HT212804
• https://support.apple.com/en-us/HT212805

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