CVE-2025-5555
BaseFortify
Publication date: 2025-10-18
Last updated on: 2026-04-29
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| nixdorf | wincor_port_io_driver | 1.0.0.1 |
| nixdorf | wincor_port_io_driver | 3.0.0.1 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-119 | The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
| CWE-121 | A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a stack-based buffer overflow in the Nixdorf Wincor PORT IO Driver (wnport.sys) up to version 1.0.0.1. It occurs in the IOCTL handler function sub_11100 due to improper input validation of buffer lengths. Attackers can send an oversized input buffer via the DeviceIoControl API, causing memory corruption and potentially triggering a system crash or enabling arbitrary code execution. This means attackers can run unauthorized commands with elevated privileges, leading to serious security risks. [1, 3]
How can this vulnerability impact me? :
Exploitation of this vulnerability can lead to system crashes (denial of service) or allow attackers to execute arbitrary code with elevated privileges. This can result in unauthorized command execution, sensitive data theft, malware installation, or full system compromise. Since the vulnerable IOCTL functions are accessible by low-privileged programs, attackers do not need elevated privileges to initiate the attack, increasing the risk. [1, 3]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by monitoring for attempts to send oversized buffers to the vulnerable IOCTL codes (0x80102040, 0x80102044, 0x80102050, 0x80102054) via the DeviceIoControl API. Detection can include checking for system crashes with PAGE_FAULT_NON_PAGE blue screen errors and monitoring for abnormal DeviceIoControl calls with unusually large input buffers targeting wnport.sys. Specific commands are not provided in the resources, but monitoring system logs for blue screen errors and using tools to trace DeviceIoControl calls with these IOCTL codes may help detect exploitation attempts. [1, 3]
What immediate steps should I take to mitigate this vulnerability?
The immediate mitigation step is to upgrade the Nixdorf Wincor PORT IO Driver to version 3.0.0.1 or later, as this version contains the patch that fixes the vulnerability. Additionally, restricting local access to the affected systems and monitoring for suspicious activity related to the vulnerable IOCTL codes can help reduce risk until the upgrade is applied. [1, 3]