CVE-2021-30897

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-24 · updated 2026-06-17

Description

An issue existed in the specification for the resource timing API. The specification was updated and the updated specification was implemented. This issue is fixed in macOS Monterey 12.0.1. A malicious website may exfiltrate data cross-origin.

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

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. Check the vendor advisory for mitigations.

References

https://support.apple.com/en-us/HT212869
https://support.apple.com/kb/HT212814
https://support.apple.com/kb/HT212815
https://support.apple.com/en-us/HT212869
https://support.apple.com/kb/HT212814
https://support.apple.com/kb/HT212815

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