What’s Vulnerable › Vulnerabilities

CVE-2021-30900: Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2023-03-30
• EPSS: 5.2% 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

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

Affected products

• Apple iPadOS: before 14.8.1; 15.0 — fixed in 14.8.1
• Apple Iphone Os: before 14.8.1; 15.0 — fixed in 14.8.1
• Apple macOS: before 11.6.1 — fixed in 11.6.1

How to fix

Upgrade to a fixed version: Apple iPadOS 14.8.1; Apple Iphone Os 14.8.1; Apple macOS 11.6.1. 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/kb/HT212872
• https://support.apple.com/en-us/HT212867
• https://support.apple.com/en-us/HT212868
• https://support.apple.com/kb/HT212872
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30900

Get alerted when CVE-2021-30900 or the next vulnerability affects your stack