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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.

• https://support.apple.com/en-us/HT212804 x_refsource_MISC
• https://support.apple.com/en-us/HT212807 x_refsource_MISC
• http://seclists.org/fulldisclosure/2021/Sep/27 mailing-listx_refsource_FULLDISC
• http://seclists.org/fulldisclosure/2021/Sep/25 mailing-listx_refsource_FULLDISC
• http://seclists.org/fulldisclosure/2021/Sep/29 mailing-listx_refsource_FULLDISC
• http://www.openwall.com/lists/oss-security/2021/09/20/1 mailing-listx_refsource_MLIST
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/ vendor-advisoryx_refsource_FEDORA
• http://seclists.org/fulldisclosure/2021/Sep/38 mailing-listx_refsource_FULLDISC
• http://seclists.org/fulldisclosure/2021/Sep/39 mailing-listx_refsource_FULLDISC
• https://www.debian.org/security/2021/dsa-4975 vendor-advisoryx_refsource_DEBIAN
• https://www.debian.org/security/2021/dsa-4976 vendor-advisoryx_refsource_DEBIAN
• https://support.apple.com/kb/HT212824 x_refsource_CONFIRM
• http://seclists.org/fulldisclosure/2021/Sep/50 mailing-listx_refsource_FULLDISC
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/ vendor-advisoryx_refsource_FEDORA
• http://www.openwall.com/lists/oss-security/2021/10/26/9 mailing-listx_refsource_MLIST
• http://www.openwall.com/lists/oss-security/2021/10/27/1 mailing-listx_refsource_MLIST
• http://www.openwall.com/lists/oss-security/2021/10/27/2 mailing-listx_refsource_MLIST
• http://www.openwall.com/lists/oss-security/2021/10/27/4 mailing-listx_refsource_MLIST
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30858 government-resource