Summary
Successful exploitation of this vulnerability could result in 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.
The following versions of Pyramid Solutions NetStaX EtherNet/IP Stack are affected:
- EtherNet/IP Adapter DLL Kit (EIPA)
- EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE)
- EtherNet/IP Adapter Development Kit (EADK)
- EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE)
- EtherNet/IP Scanner DLL Kit (EIPS)
- EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE)
- EtherNet/IP Scanner Development Kit (ESDK)
- EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE)
| CVSS | Vendor | Equipment | Vulnerabilities |
|---|---|---|---|
| v3 9.8 | Pyramid Solutions | Pyramid Solutions NetStaX EtherNet/IP Stack | Stack-based Buffer Overflow |
Background
- Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water and Wastewater, Chemical
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: United States
Vulnerabilities
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.
Affected Products
Pyramid Solutions NetStaX EtherNet/IP Stack
Pyramid Solutions
Pyramid Solutions EtherNet/IP Adapter DLL Kit (EIPA): <v5.6.1, Pyramid Solutions EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE): <v5.6.1, Pyramid Solutions EtherNet/IP Adapter Development Kit (EADK): <v5.6.1, Pyramid Solutions EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE): <v5.6.1, Pyramid Solutions EtherNet/IP Scanner DLL Kit (EIPS): <v5.6.1, Pyramid Solutions EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE): <v5.6.1, Pyramid Solutions EtherNet/IP Scanner Development Kit (ESDK): <v5.6.1, Pyramid Solutions EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE): <v5.6.1
known_affected
Remediations
Mitigation
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/
Mitigation
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/
Relevant CWE: CWE-121 Stack-based Buffer Overflow
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 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 |
Acknowledgments
- Pyramid Solutions reported this vulnerability to CISA
Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification and this Privacy & Use policy (https://www.cisa.gov/privacy-policy
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as virtual private networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.
Revision History
- Initial Release Date: 2026-09-03
| Date | Revision | Summary |
|---|---|---|
| 2026-09-03 | 1 | Initial Republication of Pyramid Solutions blog publication. |
Legal Notice and Terms of Use
This product is provided subject to this Notification and this Privacy & Use policy.