What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 13.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-24 · updated 2026-06-17
• Weakness: CWE-416

Description

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; from 13.0 before 14.8 — fixed in 12.5.5, 14.8
• Apple macOS: before 11.6 — fixed in 11.6
• Debian Linux: 10.0, 11.0
• Fedoraproject Fedora: 33, 34

How to fix

Upgrade to a fixed version: Apple iPadOS 14.8; Apple Iphone Os 12.5.5, 14.8; Apple macOS 11.6. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2021/Sep/25
• http://seclists.org/fulldisclosure/2021/Sep/27
• http://seclists.org/fulldisclosure/2021/Sep/29
• http://seclists.org/fulldisclosure/2021/Sep/38
• http://seclists.org/fulldisclosure/2021/Sep/39
• http://seclists.org/fulldisclosure/2021/Sep/50
• http://www.openwall.com/lists/oss-security/2021/09/20/1
• http://www.openwall.com/lists/oss-security/2021/10/26/9
• http://www.openwall.com/lists/oss-security/2021/10/27/1
• http://www.openwall.com/lists/oss-security/2021/10/27/2
• http://www.openwall.com/lists/oss-security/2021/10/27/4
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/

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