CVE-2025-5555 | Nixdorf Wincor PORT IO Driver up to 1.0.0.1 IOCTL wnport.sys sub_11100 stack-based overflow

A vulnerability described as critical has been identified in Nixdorf Wincor PORT IO Driver up to 1.0.0.1. This affects the function sub_11100 in the library wnport.sys of the component IOCTL Handler. Such manipulation leads to stack-based buffer overflow.

This vulnerability is uniquely identified as CVE-2025-5555. Local access is required to approach this attack. Moreover, an exploit is present.

Upgrading the affected component is recommended.

The vendor was contacted beforehand and was able to provide a patch very early.