Apple has released another update (previous update was only about 5 days ago) to address CVE-2021-30807 that was discovered by an anonymous researcher. This update resolves an issue with IOMobileFrameBuffer which could allow an application to execute arbitrary code with kernel privileges , . This issue may have been actively exploited.
As Apple has indicated that this issue may have been actively exploited, it is recommended that affected devices be updated as soon as possible.
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Source: Read More (SANS Internet Storm Center, InfoCON: green)