CVE-2021-30858: Apple iOS, iPadOS, macOS Use-After-Free Vulnerability

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 13.4% chance of exploitation in the next 30 days.

A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. 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.

Affected products

• Apple iPadOS: from 13.1, before 14.8 (fixed in 14.8)
• Apple iPhone OS: before 12.5.5 (fixed in 12.5.5); from 13.0, before 14.8 (fixed in 14.8)
• Apple macOS: before 11.6 (fixed in 11.6)
• Debian Debian Linux: version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 33 only; version 34 only

Published 2021-08-24. Last modified 2026-06-17.