Vulnerability Intelligence Report
Apple Multiple Products WebKit Integer Overflow Vulnerability
CVE-2021-30663
An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
7.8
HIGH
Exploitability:1.9
Impact Score:5.9
EPSS Probability:3.47%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-190 ↗CWE-190 Integer Overflow or Wraparound
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Apple | macOS | unspecified < 11.3 (affected) |
| Apple | macOS | unspecified < 14.5 (affected) |
| Apple | macOS | unspecified < 12.5 (affected) |
| Apple | macOS | unspecified < 14.6 (affected) |
| Apple | macOS | unspecified < 14.1 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Apple Inc. · Vendor · USA |
| Reserved | 2021-04-13T00:00:00 |
| Published | 2021-09-08T14:49:41 |
| Last Updated | 2025-10-21T23:25:34 |
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