“Flaws would have allowed the bad guys to capture network credentials, gain root control of your Mac, or read data stored in memory that is supposed to be protected,” Chaffin reports. “These patches were included in macOS 10.12.5, but Apple also released standalone security updates for El Capitan and Yosemite:”
Full list of fixes here.
MacDailyNews Take: The Mac gets even more secure!
Apple releases macOS Sierra 10.12.5 – May 15, 2017