Users that run unpatched software beware. Hackers have been relying on an old software bug tied to the Stuxnet worm to carry out their attacks.

Microsoft may have initially patched the flaw in 2010, but it’s nevertheless become the most widespread software exploit, according to security firm Kaspersky Lab.

On Thursday, Kaspersky posted research examining the use of exploits, or malicious programs designed to take advantage of certain software flaws. Once an exploit goes to work, it can typically pave the way for other malicious programs to install onto a computer.

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