Vulnerability · Published Sep 1, 2026 · Assigned by icscert
CVE-2026-78012Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack
Critical 9.8
In plain English
A critical-severity stack buffer overflow in EtherNet/IP Adapter Development Kit (EADK) from Pyramid Solutions. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Official description
An issue in the NetStaX EtherNet/IP Stack prior to v5.6.1 could allow a large Class 3 explicit-message request to exceed the application-side receive buffer without generating an error or warning. The result could be memory corruption, a device crash, or a potential remote attack vector without the originating device receiving a CIP error indicating that the request could not be processed.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Pyramid Solutions | EtherNet/IP Adapter DLL Kit (EIPA) | 0 – through v5.6.1 |
| Pyramid Solutions | EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE) | 0 – through v5.6.1 |
| Pyramid Solutions | EtherNet/IP Adapter Development Kit (EADK) | 0 – through v5.6.1 |
| Pyramid Solutions | EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE) | 0 – through v5.6.1 |
| Pyramid Solutions | EtherNet/IP Scanner DLL Kit (EIPS) | 0 – through v5.6.1 |
| Pyramid Solutions | EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE) | 0 – through v5.6.1 |
| Pyramid Solutions | EtherNet/IP Scanner Development Kit (ESDK) | 0 – through v5.6.1 |
| Pyramid Solutions | EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE) | 0 – before v5.6.1 |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H