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Let's imagine just one example of patching a remote hole in a Windows server. First, you have to stage a duplicate of an old server with a new patch, which can take days. A production environment may need significant development effort just to integrate the patch, which takes days. Then run all tests and QC processes against it, which can take days. Then you can deploy it during a maintenance window. This is 1-2 business weeks. Now multiply that times 1,000 different combinations of versions of Windows, applications, networks, platforms, and so on. You're not just patching "servers", anyway. You're patching bare metal machines, hypervisors, AMIs, container images, software packages, plugins, network applications, security policies. Often vendor platforms don't even have a patch available so you have to implement a custom workaround, if one exists. One could write an entire book about this subject. Please believe me, it's not simple. |