Apple released updates for iTunes, iOS, Safari, OS X El Capitan, tvOS, and watchOS. Since these products contain shared code, many of the same vulnerabilities exist within multiple Apple products. The good news is that fixing the vulnerability in one product, also resolves it the other ones. Some of the vulnerabilities found in these products, including iOS and OS X, allow remote code execution. Therefore, it is strongly advised that you upgrade your Apple devices as soon as possible. For a full list of vulnerabilities for each Apple product, you can consult the table below.
Source: https://www.bleepingcomputer.com/news/security/apple-patches-critical-vulnerabilities-in-core-products/