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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00475.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Pyramid Solutions EtherNet/IP Adapter DLL Kit (EIPA) unaffected
Version Status Constraints
0 affected ≤ v5.6.1
v5.6.1 unaffected —
Pyramid Solutions EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE) unaffected
Version Status Constraints
0 affected ≤ v5.6.1
v5.6.1 unaffected —
Pyramid Solutions EtherNet/IP Adapter Development Kit (EADK) unaffected
Version Status Constraints
0 affected ≤ v5.6.1
v5.6.1 unaffected —
Pyramid Solutions EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE) unaffected
Version Status Constraints
0 affected ≤ v5.6.1
v5.6.1 unaffected —
Pyramid Solutions EtherNet/IP Scanner DLL Kit (EIPS) unaffected
Version Status Constraints
0 affected ≤ v5.6.1
v5.6.1 unaffected —
Pyramid Solutions EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE) unaffected
Version Status Constraints
0 affected ≤ v5.6.1
v5.6.1 unaffected —
Pyramid Solutions EtherNet/IP Scanner Development Kit (ESDK) unaffected
Version Status Constraints
0 affected ≤ v5.6.1
v5.6.1 unaffected —
Pyramid Solutions EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE) unaffected
Version Status Constraints
0 affected < v5.6.1
v5.6.1 unaffected —

No data.

No data.

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No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

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/

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-246-07.json cve-icon cve-icon
https://pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-ethernet-ip-stack-explicit-messages/ cve-icon cve-icon
https://www.cisa.gov/news-events/ics-advisories/icsa-26-246-07 cve-icon cve-icon
History

Fri, 04 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
References

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 01 Sep 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published:

Updated: 2026-09-04T21:05:12.277Z

Reserved: 2026-08-21T22:15:28.774Z

Link: CVE-2026-78012

cve-icon Vulnrichment

Updated: 2026-09-01T15:30:10.495Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-01T15:17:28.013

Modified: 2026-09-08T15:28:33.090

Link: CVE-2026-78012

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T16:30:17Z

Weaknesses