CVE-2021-30663CISA KEVEPSS p87.5%

CVE-2021-30663Apple Multiple Products WebKit Integer Overflow Vulnerability

Apple / Multiple Products

Description

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.

Scoring

EPSS3.47% probability of exploitation · percentile 87.5% · 2026-06-18T12:00:27Z

CISA KEV entry

Added to KEV: 2021-11-03

(incoming)1

TypeTargetConfidenceTier
KEVEntryApple Multiple Products WebKit Integer Overflow Vulnerabilitykev-cve-2021-306630%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
Apple Multiple Products WebKit Memory Corruption Vulnerability
CVE
Apple iOS WebKit Buffer Overflow Vulnerability
CVE
Apple Multiple Products Integer Overflow or Wraparound Vulnerability
CVE
Apple Multiple Products WebKit Storage Use-After-Free Vulnerability
CVE
Apple iOS WebKit Memory Corruption Vulnerability
CVE
Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.