I do not think you ca fully rely on the vendor to say a patch is ok. Most of the time the patch does not fit your environment. I can not tell you how many times I have seen management say a patch has to be applied immediately without testing and it causes havouc with a local system. Every patch should be tested to some degree to be sure it is going to work in your environment being that the vendors do not have the same enviroment that you do. Always test everything before you apply it.
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