CVE-2026-78012

Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack

State: Published
Severity: 9.3 Critical
Published: Sep 1, 2026
Updated: Sep 4, 2026
Reserved: Aug 21, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	icscert
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	icscert

Weaknesses

CWE-121

Affected Products

Product	Versions
EtherNet/IP Adapter DLL Kit (EIPA)Pyramid Solutions	v5.6.1 and earlierAffected v5.6.1Not affected
EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE)Pyramid Solutions	v5.6.1 and earlierAffected v5.6.1Not affected
EtherNet/IP Adapter Development Kit (EADK)Pyramid Solutions	v5.6.1 and earlierAffected v5.6.1Not affected
EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE)Pyramid Solutions	v5.6.1 and earlierAffected v5.6.1Not affected
EtherNet/IP Scanner DLL Kit (EIPS)Pyramid Solutions	v5.6.1 and earlierAffected v5.6.1Not affected
EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE)Pyramid Solutions	v5.6.1 and earlierAffected v5.6.1Not affected
EtherNet/IP Scanner Development Kit (ESDK)Pyramid Solutions	v5.6.1 and earlierAffected v5.6.1Not affected
EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE)Pyramid Solutions	before v5.6.1Affected v5.6.1Not affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.