Provide references for CVE-2021-30768.
Where can I find more information about CVE-2021-30768?
References are available at: https://support.apple.com/en-us/HT212601, https://support.apple.com/en-us/HT212602, https://support.apple.com/en-us/HT212605, https://support.apple.com/en-us/HT212600, https://support.apple.com/en-us/HT212604.