CVE-2026-78012: CWE-121 in Pyramid Solutions EtherNet/IP Adapter DLL Kit (EIPA)
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.
CVSS v3.1
Score 9.8critical
Affected software
Pyramid Solutions
EtherNet/IP Adapter DLL Kit (EIPA)
Pyramid Solutions
EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE)
Pyramid Solutions
EtherNet/IP Adapter Development Kit (EADK)
Pyramid Solutions
EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE)
Pyramid Solutions
EtherNet/IP Scanner DLL Kit (EIPS)
Pyramid Solutions
EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE)
Pyramid Solutions
EtherNet/IP Scanner Development Kit (ESDK)
Pyramid Solutions
EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-121) in the NetStaX EtherNet/IP Stack before v5.6.1 allows a large Class 3 explicit-message request to overflow the application-side receive buffer silently. The overflow can lead to memory corruption and device crashes. Because no CIP error is generated, the originating device may not detect the failure, creating a potential remote attack vector. The CVSS 3.1 base score is 9.8, indicating critical severity with network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation can result in memory corruption and device crashes, potentially allowing remote attackers to disrupt device operation or execute arbitrary code. The lack of error reporting to the originating device increases the risk of undetected attacks, impacting system reliability and security.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary mitigation has been documented at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- icscert
- Date Reserved
- 2026-08-21T22:15:28.774Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a96edc2acd9273b49deccd2
Added to database: 09/01/2026, 15:22:42 UTC
Last enriched: 09/07/2026, 11:49:46 UTC
Last updated: 10/14/2026, 18:48:24 UTC
Views: 81
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