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An integer overflow was addressed with improved input validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. Processing a maliciously crafted PDF may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

• http://seclists.org/fulldisclosure/2021/Sep/28 mailing-listx_refsource_FULLDISC
• https://support.apple.com/en-us/HT212804 x_refsource_MISC
• https://support.apple.com/en-us/HT212805 x_refsource_MISC
• https://support.apple.com/en-us/HT212807 x_refsource_MISC
• https://support.apple.com/en-us/HT212806 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/26 mailing-listx_refsource_FULLDISC
• http://seclists.org/fulldisclosure/2021/Sep/40 mailing-listx_refsource_FULLDISC
• http://seclists.org/fulldisclosure/2021/Sep/38 mailing-listx_refsource_FULLDISC
• http://seclists.org/fulldisclosure/2021/Sep/39 mailing-listx_refsource_FULLDISC
• https://support.apple.com/kb/HT212824 x_refsource_CONFIRM
• http://seclists.org/fulldisclosure/2021/Sep/50 mailing-listx_refsource_FULLDISC
• http://www.openwall.com/lists/oss-security/2022/09/02/11 mailing-listx_refsource_MLIST
• https://security.gentoo.org/glsa/202209-21 vendor-advisoryx_refsource_GENTOO
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30860 government-resource