What’s Vulnerable › Vulnerabilities

CVE-2021-30884

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-24 · updated 2026-06-17

Description

The issue was resolved with additional restrictions on CSS compositing. This issue is fixed in tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Visiting a maliciously crafted website may reveal a user's browsing history.

Affected products

• Apple iPadOS: before 15.0 — fixed in 15.0
• Apple Iphone Os: before 15.0 — fixed in 15.0
• Apple macOS: before 12.0.1 — fixed in 12.0.1
• 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 15.0; Apple Iphone Os 15.0; Apple macOS 12.0.1; 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/HT212814
• https://support.apple.com/en-us/HT212815
• 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/HT212814
• https://support.apple.com/en-us/HT212815
• https://support.apple.com/en-us/HT212819
• https://support.apple.com/kb/HT212869

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