A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
https://www.tenable.com/cyber-exposure/2021-threat-landscape-retrospective
https://support.apple.com/en-us/HT212147
https://support.apple.com/en-us/HT212146