Mac OS X 10.7, aka Lion, and 10.6, better known as Snow Leopard, were updated with fixes. Some Lion users reported post-update catastrophes. Apple patched six vulnerabilities in QuickTime that could be triggered with malicious image, audio or video files. Apple was late to patching the same bug in iOS and other vendors, including Microsoft and Mozilla, had also beat Apple to this patch punch. Apple also revoked trust in all certificates issued by a Malaysian intermediate certificate authority.”]
Source: https://www.csoonline.com/article/2130827/apple-updates-lion–patches-51-bugs-in-mac-os-x.html