Patch management is the optimal solution to protect computers against known software flaws for which vendor patches exist. Third-party products that attempt to correct these flaws solely through firewalls, anti-virus software or intrusion-prevention systems alone are not reliable, for several reasons. An operating system or application vendor that releases a patch is the only organization that truly understands the nature and extent of the flaw; thus, it is best suited to supply the solution. Many times the patch corrects more items and avenues for attack than are known outside of the vendor, including knowledge supplied by the person(s) who originally found and reported the flaw. Because the vendor has access to the source code, it can identify each component of the operating system or application that might be affected, and it can update the relevant bits of code to prevent the flaw in each instance.
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