Vulnerability Intelligence Report
Apple iOS WebKit Buffer Overflow Vulnerability
CVE-2021-30666
A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.5.3. 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..
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
8.8
HIGH
Exploitability:2.9
Impact Score:5.9
EPSS Probability:2.81%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
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Weaknesses (CWE)
CWE-119 ↗CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Apple | iOS | unspecified < 12.5 (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 | 2021-09-08T14:25:25 |
| Last Updated | 2025-10-21T23:25:34 |
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