Apple Multiple Products WebKit Memory Corruption Vulnerability

HIGH 8.8EXPLOITED (CISA KEV)CVE-2021-30665 · Published 08/09/2021 · updated 17/06/2026

Apple Multiple Products WebKit Memory Corruption Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 03/11/2021. Patch affected systems as an emergency.

Package	Affected versions	Patched versions
Multiple Products Apple	Versions not published yet (product named by CISA KEV)

Description

A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 7.4.1, iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

References

support.apple.com/en-us/HT212335 · Release Notes
support.apple.com/en-us/HT212336 · Release Notes
support.apple.com/en-us/HT212339 · Release Notes
support.apple.com/en-us/HT212341 · Release Notes
support.apple.com/en-us/HT212532 · Release Notes
cisa.gov/known-exploited-vulnerabilities-catalog · Third Party Advisory
CISA KEV · CVE-2021-30665

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