Nixdorf Wincor PORT IO Driver IOCTL wnport.sys sub_11100 stack-based overflow
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Nixdorf Wincor | PORT IO Driver | 1.0.0.0; 1.0.0.1 | 3.0.0.1 | Patch available | CNA |
- PORT IO Driver VendorNixdorf Wincor Affected 1.0.0.0; 1.0.0.1 Fixed in 3.0.0.1 Patch available CNA
Remediation
- Fix · CNA PORT IO Driver (Nixdorf Wincor) Fixed in 3.0.0.1
Timeline
- 2026-10-02 Threatist record created from CVE-2025-5555
- 2026-10-03 Alias added: GHSA-9gv5-442j-6rr2
References
Sources
- CVE-2025-5555 · CVE Program
- CVE-2025-5555 · NVD
- FIRST EPSS
- GHSA-9gv5-442j-6rr2 · GitHub Advisory Database · CC BY 4.0
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