An old software bug tied to the Stuxnet worm is the most widespread software exploit, security firm Kaspersky Lab says. The vulnerability only affects Windows XP, Windows Server 2008, and Windows 7. Microsoft has already issued patches fixing the software flaws the tools the tools target. The research highlights other well-known vulnerabilities in Microsoft Office, Android, and Java that hackers are still targeting, despite past software fixes. The lesson: Hackers can still succeed when computers are still running out-of-date software.”]