What’s Vulnerable › Vulnerabilities

CVE-2021-30818

• Severity: high (CVSS 8.8 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: 2021-10-28 · updated 2026-06-17
• Weakness: CWE-843

Description

A type confusion issue was addressed with improved state handling. This issue is fixed in iOS 14.8 and iPadOS 14.8, tvOS 15, iOS 15 and iPadOS 15, Safari 15, watchOS 8. Processing maliciously crafted web content may lead to arbitrary code execution.

Affected products

• Apple iPadOS: before 14.8 — fixed in 14.8
• Apple Iphone Os: before 14.8 — fixed in 14.8
• Apple macOS: before 12.0.1 — fixed in 12.0.1
• Apple Safari: before 15.0 — fixed in 15.0
• Apple tvOS: before 15.0 — fixed in 15.0
• Apple watchOS: before 8.0 — fixed in 8.0

How to fix

Upgrade to a fixed version: Apple iPadOS 14.8; Apple Iphone Os 14.8; Apple macOS 12.0.1; Apple Safari 15.0; Apple tvOS 15.0; Apple watchOS 8.0. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/12/20/6
• https://support.apple.com/en-us/HT212807
• https://support.apple.com/en-us/HT212814
• https://support.apple.com/en-us/HT212815
• https://support.apple.com/en-us/HT212816
• https://support.apple.com/en-us/HT212819
• https://support.apple.com/kb/HT212869
• http://www.openwall.com/lists/oss-security/2021/12/20/6
• https://support.apple.com/en-us/HT212807
• https://support.apple.com/en-us/HT212814
• https://support.apple.com/en-us/HT212815
• https://support.apple.com/en-us/HT212816

Get alerted when CVE-2021-30818 or the next vulnerability affects your stack