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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-78012
StatePUBLISHED
Assignericscert
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-01 15:17:28 UTC
Updated2026-09-04 22:17:18 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v4.0 9.3 CRITICAL from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.003950000 probability, percentile 0.326720000 (date 2026-09-04)

Problem Types: CWE-121 | CWE-121 CWE-121

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary9.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS9.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pyramid Solutions EtherNet/IP Adapter DLL Kit EIPA affected v5.6.1 custom Not specified
CNA Pyramid Solutions EtherNet/IP Adapter DLL Kit EIPA unaffected v5.6.1 Not specified
CNA Pyramid Solutions EtherNet/IP Adapter DLL Kit With CIP Security EIPA-SECURE affected v5.6.1 custom Not specified
CNA Pyramid Solutions EtherNet/IP Adapter DLL Kit With CIP Security EIPA-SECURE unaffected v5.6.1 Not specified
CNA Pyramid Solutions EtherNet/IP Adapter Development Kit EADK affected v5.6.1 custom Not specified
CNA Pyramid Solutions EtherNet/IP Adapter Development Kit EADK unaffected v5.6.1 Not specified
CNA Pyramid Solutions EtherNet/IP Adapter Development Kit With CIP Security EADK-SECURE affected v5.6.1 custom Not specified
CNA Pyramid Solutions EtherNet/IP Adapter Development Kit With CIP Security EADK-SECURE unaffected v5.6.1 Not specified
CNA Pyramid Solutions EtherNet/IP Scanner DLL Kit EIPS affected v5.6.1 custom Not specified
CNA Pyramid Solutions EtherNet/IP Scanner DLL Kit EIPS unaffected v5.6.1 Not specified
CNA Pyramid Solutions EtherNet/IP Scanner DLL Kit With CIP Security EIPS-SECURE affected v5.6.1 custom Not specified
CNA Pyramid Solutions EtherNet/IP Scanner DLL Kit With CIP Security EIPS-SECURE unaffected v5.6.1 Not specified
CNA Pyramid Solutions EtherNet/IP Scanner Development Kit ESDK affected v5.6.1 custom Not specified
CNA Pyramid Solutions EtherNet/IP Scanner Development Kit ESDK unaffected v5.6.1 Not specified
CNA Pyramid Solutions EtherNet/IP Scanner Development Kit With CIP Security ESDK-SECURE affected v5.6.1 custom Not specified
CNA Pyramid Solutions EtherNet/IP Scanner Development Kit With CIP Security ESDK-SECURE unaffected v5.6.1 Not specified

References

ReferenceSourceLinkTags
github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-24... [email protected] github.com
pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-... [email protected] pyramidsolutions.com
www.cisa.gov/news-events/ics-advisories/icsa-26-246-07 [email protected] www.cisa.gov
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Pyramid Solutions reported this vulnerability to CISA. (en)

Additional Advisory Data

Solutions

CNA: NetStaX v5.6.1 addresses this issue with multiple layers of protection, including a compile-time assertion, a runtime payload-size check, and clearer documentation of the relationships between packet and buffer-size constants. https://pyramidsolutions.com/my-account/ For more information, see the Pyramid Solutions blog post "NetStaX v5.6.1: Protecting Against Silent Buffer Overflow in Ethernet/IP Stack Explicit Messages". https://pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-ethernet-ip-stack-explicit-messages/

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