Vulnerability Intelligence Report
Apple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability
CVE-2021-1870
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
CISA KEV
SSVC: Active Exploitation
Automatable
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:7.92%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-1173 ↗CWE-1173 (via CISA KEV)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Apple | iOS and iPadOS | unspecified < 14.4 (affected) |
| Apple | macOS | unspecified < 11.2 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Apple Inc. · Vendor · USA |
| Reserved | 2020-12-08T00:00:00 |
| Published | 2021-04-02T18:06:42 |
| Last Updated | 2025-10-21T23:25:49 |
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