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

criticalknown exploitedCVE-2021-30663
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: AppleRemote code execution
What
An integer overflow vulnerability leads to code execution when processing malicious web content.
Who is affected
Users of Apple iOS, iPadOS, macOS, tvOS, and Safari WebKit.
Urgency
Immediate remediation is necessary due to active exploitation and critical severity.
Action
Update to the latest version of affected Apple products.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-30663

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-30663coverage & exploitation statusNVD · CVE.org

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