01 Record

CVE-2026-78012

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

CriticalPUBLISHEDCNA: icscert

CNA base score9.3 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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02 Description

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

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.64% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 50.5% of scored records. A rank, not a probability.

NVD base score

9.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS 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/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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-08.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-09-01 15:01Z1 MO AGO

Last updated

2026-09-04 21:05Z1 MO AGO

Reserved

2026-08-21

Assigning CNA

icscert

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS 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

Weaknesses

CWE-121Stack-based Buffer OverflowVariant

Data version

5.2

Document digest

7333ace55413c56cda648bf6038d1903129d9e0c7ba6c74db2c8ad07bef954f1

05 Affected products

VendorProductVersionsPlatforms

Pyramid SolutionsEtherNet/IP Adapter DLL Kit (EIPA)0 to v5.6.1—

Pyramid SolutionsEtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE)0 to v5.6.1—

Pyramid SolutionsEtherNet/IP Adapter Development Kit (EADK)0 to v5.6.1—

Pyramid SolutionsEtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE)0 to v5.6.1—

Pyramid SolutionsEtherNet/IP Scanner DLL Kit (EIPS)0 to v5.6.1—

Pyramid SolutionsEtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE)0 to v5.6.1—

Pyramid SolutionsEtherNet/IP Scanner Development Kit (ESDK)0 to v5.6.1—

Pyramid SolutionsEtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE)0 to < v5.6.1—

06 References

07 Remediation

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/