What’s Vulnerable › Vulnerabilities

CVE-2021-30830

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-19 · updated 2026-06-17
• Weakness: CWE-787

Description

A memory corruption issue was addressed with improved memory handling. This issue is fixed in Security Update 2021-005 Catalina, macOS Big Sur 11.6. A malicious application may be able to execute arbitrary code with kernel privileges.

Affected products

• macOS: from 10.15 through 10.15.6; 10.15.7, 10.15.7-security_update_2020, 10.15.7-security_update_2020-001, 10.15.7-security_update_2020-005, 10.15.7-security_update_2020-007, 10.15.7-security_update_2021-001 (+3)
• Apple macOS: from 11.0 before 11.6 — fixed in 11.6

How to fix

Upgrade to a fixed version: 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

Get alerted when CVE-2021-30830 or the next vulnerability affects your stack