Not necessarily. If you’re running a product or service pack that is not supported by Microsoft’s product lifecycle policies, your system may not be secure even if you apply all the updates provided by the search tool. Microsoft generally develops updates only for the current and next-to-current versions of a product and the current and next-to-current service packs for each. If you are using a product or service pack that is no longer supported, a update might not be available for it, even though it might be affected by the vulnerability. Read more about
Microsoft’s product lifecycle policies.
Occasionally, a security fix is included in a service pack and not made available as a update. For example, Microsoft might take this step if a fix is so complex that it requires the level of regression testing that can only be applied to a service pack. In addition, some security updates can only be installed on
recent service packs because of dependencies on particular versions of the product files.
To ensure that you have the latest set of security fixes, you should install the latest service pack and then apply the updates appropriate for your product and service pack.