What’s Vulnerable › Vulnerabilities

CVE-2021-30909

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% 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, tvOS 15.1, watchOS 8.1, Security Update 2021-007 Catalina, macOS Big Sur 11.6.1. An 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 15.1 — fixed in 15.1
• Apple watchOS: before 8.1 — fixed in 8.1

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 15.1; Apple watchOS 8.1. Check the vendor advisory for mitigations.

References

• 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/en-us/HT212874
• https://support.apple.com/en-us/HT212876
• 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

Get alerted when CVE-2021-30909 or the next vulnerability affects your stack