What’s Vulnerable › Vulnerabilities

CVE-2021-30807: Apple Multiple Products Memory Corruption Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 28.8% 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 macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited.

Affected products

• Apple iPadOS: before 14.7.1 — fixed in 14.7.1
• Apple Iphone Os: before 14.7.1 — fixed in 14.7.1
• Apple macOS: before 11.5.1 — fixed in 11.5.1
• Apple watchOS: before 7.6.1 — fixed in 7.6.1

How to fix

Upgrade to a fixed version: Apple iPadOS 14.7.1; Apple Iphone Os 14.7.1; Apple macOS 11.5.1; Apple watchOS 7.6.1. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT212622
• https://support.apple.com/en-us/HT212623
• https://support.apple.com/en-us/HT212713
• https://support.apple.com/en-us/HT212622
• https://support.apple.com/en-us/HT212623
• https://support.apple.com/en-us/HT212713
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30807

Get alerted when CVE-2021-30807 or the next vulnerability affects your stack