Last year, for instance, Mohave's final non-security update, 10.14.6, made the scene on July 22, or 77 days before Catalina's release. More telling, Apple has a habit of releasing the last non-security update for the then-current edition about 10 weeks before the successor goes public. When a new edition launches – this year's upcoming Big Sur – the oldest (n-2) falls off the support list. Apple supports the latest edition of macOS (call it "n") and the two before that ("n-1" and "n-2). Likewise, the Security Update 2020-004, also issued Wednesday, was almost certainly the last for macOS 10.13 High Sierra, the operating system Apple launched in September 2017. For the last three cycles – Mojave, High Sierra and Sierra – Apple released six non-security updates to each edition the four before that topped out at five updates apiece. MacOS 10.15.6 will likely be the final non-security update to Catalina, the still-current Mac operating system. Most of the flaws, absent a fix, might have let criminals run attack code on a compromised Mac. The update also patches 19 security vulnerabilities in 16 of Catalina's components, ranging from Audio and Kernel to Mail and Wi-Fi.
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