system
Provide references for <CVE-2020-9991>.
user
Where can I find more information about <CVE-2020-9991>?
assistant
References are available at: https://support.apple.com/kb/HT211846, https://support.apple.com/en-us/HT211843, https://support.apple.com/en-us/HT211850, https://support.apple.com/en-us/HT211844, https://support.apple.com/en-us/HT211931, https://support.apple.com/en-us/HT211847, http://seclists.org/fulldisclosure/2020/Dec/32, https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E.