What’s Vulnerable › Vulnerabilities

CVE-2021-30916

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% 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-787

Description

A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 15.1 and iPadOS 15.1, macOS Monterey 12.0.1, iOS 14.8.1 and iPadOS 14.8.1, Security Update 2021-007 Catalina, macOS Big Sur 11.6.1. A malicious application may be able to execute arbitrary code with kernel privileges.

Affected products

• Apple Ipad Os: before 14.8.1 — fixed in 14.8.1
• Apple iPadOS: 15.0
• Apple Iphone Os: before 14.8.1; 15.0 — fixed in 14.8.1
• 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 (+3) — fixed in 10.15.7
• Apple macOS: from 11.0 before 11.6.1; 12.0 — fixed in 11.6.1
• Apple tvOS: before 15.2 — fixed in 15.2
• Apple watchOS: before 8.3 — fixed in 8.3

How to fix

Upgrade to a fixed version: Apple Ipad Os 14.8.1; Apple Iphone Os 14.8.1; macOS 10.15.7; Apple macOS 11.6.1; Apple tvOS 15.2; Apple watchOS 8.3. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2021/Dec/43
• http://seclists.org/fulldisclosure/2021/Dec/44
• https://support.apple.com/en-us/HT212867
• https://support.apple.com/en-us/HT212868
• https://support.apple.com/en-us/HT212869
• https://support.apple.com/en-us/HT212871
• https://support.apple.com/en-us/HT212872
• https://support.apple.com/kb/HT212975
• https://support.apple.com/kb/HT212980
• http://seclists.org/fulldisclosure/2021/Dec/43
• http://seclists.org/fulldisclosure/2021/Dec/44
• https://support.apple.com/en-us/HT212867

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