Actively exploited in the wild
Apple iOS WebKit Buffer Overflow Vulnerability
Apple - iOS · Listed in the CISA KEV since 2021-11-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2021-30666
HighCVSS 8.8KEVSummary
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.
Risk Assessment
Enables remote code execution after visiting a malicious website. Apple is aware the issue may have been actively exploited.
Recommendation
Update iOS to version 12.5.3 or later on all devices. Avoid visiting untrusted websites until the update is applied.
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Original NVD description (English source)
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..