CVE-2026-78012

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-01 15:17

Updated : 2026-09-08 15:28

NVD link : CVE-2026-78012

Mitre link : CVE-2026-78012

CVE.ORG link : CVE-2026-78012

JSON object : View

Products Affected

No product.

CWE

CWE-121

Stack-based Buffer Overflow

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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."}], "lastModified": "2026-09-08T15:28:33.090", "sourceIdentifier": "ics-cert@hq.dhs.gov"}