Microsoft issues a patch to fix a critical Remote Code Execution vulnerability in Windows 7, Windows Server 2008 R2, and Windows Server 2008, and out-of-support Windows 2003 and Windows XP.
Windows 8 and Windows 10 are unaffected.
The reason Microsoft gave for fixing older Windows systems, and out -of-support systems, such as XP, was that a remote code execution could turn the PCs into a source of future vulnerability, infecting other vulnerable systems.
Microsoft strongly advises all affected systems be updated as soon as possible.
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blogs.technet.microsoft.com...]