kb/HT201222. is it a hacker attack...
wiat is it ?
macOS Catalina Security Update 2021-003 10.15.7 –– Restart Required
Security Update 2021-003 is recommended for all users and improves the security of macOS.
For more information on the security content of this update, see https://support.apple.com/kb/HT201222.
Mac OS X Server