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CVE-2021-30663CISA KEV

Apple Multiple Products WebKit Integer Overflow Vulnerability

CISA lists this Apple Multiple Products vulnerability as known exploited. The vendor's advisory has the fixed versions.

CISA KEVVendor advisoryNVD

CISA catalog record

Apple iOS, iPadOS, macOS, tvOS, and Safari WebKit contain an integer overflow vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

Product
Multiple Products
Added to KEV
3 Nov 2021
Federal remediation due
17 Nov 2021
Known ransomware use
Not reported

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 14 Oct 14:57 UTC · 254 of 255 readable · 253 fully read · documentation 0/409 current

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