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Vulnerability · Published Oct 18, 2025 · Assigned by VulDB

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

High 7.8

In plain English

A high-severity stack buffer overflow in PORT IO Driver from Nixdorf Wincor. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 85.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A vulnerability has been found 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. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. Upgrading to version 3.0.0.1 is able to mitigate this issue. Upgrading the affected component is recommended. The vendor was contacted beforehand and was able to provide a patch very early.

Affected products (as reported)

VendorProductVersions
Nixdorf Wincor PORT IO Driver 1.0.0.01.0.0.1

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

References