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**Name of the Vulnerable Software and Affected Versions** Nixdorf Wincor PORT IO Driver versions up to 1.0.0.1 **Description** A flaw exists in the IOCTL Handler component of Nixdorf Wincor PORT IO Driver, specifically within the `sub 11100` function in the `wnport.sys` library. This issue leads to a stack-based buffer overflow, requiring local access for exploitation. The exploit details have been publicly disclosed. **Recommendations** Upgrade to version 3.0.0.1 to resolve the issue.