{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-78012", "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "state": "PUBLISHED", "assignerShortName": "icscert", "dateReserved": "2026-08-21T22:15:28.774Z", "datePublished": "2026-09-01T15:01:49.064Z", "dateUpdated": "2026-09-01T15:01:49.064Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "shortName": "icscert", "dateUpdated": "2026-09-01T15:01:49.064Z"}, "title": "Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-121", "description": "CWE-121", "type": "CWE"}]}], "affected": [{"vendor": "Pyramid Solutions", "product": "EtherNet/IP Adapter DLL Kit (EIPA)", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "v5.6.1", "versionType": "custom"}, {"status": "unaffected", "version": "v5.6.1"}], "defaultStatus": "unaffected"}, {"vendor": "Pyramid Solutions", "product": "EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE)", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "v5.6.1", "versionType": "custom"}, {"status": "unaffected", "version": "v5.6.1"}], "defaultStatus": "unaffected"}, {"vendor": "Pyramid Solutions", "product": "EtherNet/IP Adapter Development Kit (EADK)", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "v5.6.1", "versionType": "custom"}, {"status": "unaffected", "version": "v5.6.1"}], "defaultStatus": "unaffected"}, {"vendor": "Pyramid Solutions", "product": "EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE)", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "v5.6.1", "versionType": "custom"}, {"status": "unaffected", "version": "v5.6.1"}], "defaultStatus": "unaffected"}, {"vendor": "Pyramid Solutions", "product": "EtherNet/IP Scanner DLL Kit (EIPS)", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "v5.6.1", "versionType": "custom"}, {"status": "unaffected", "version": "v5.6.1"}], "defaultStatus": "unaffected"}, {"vendor": "Pyramid Solutions", "product": "EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE)", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "v5.6.1", "versionType": "custom"}, {"status": "unaffected", "version": "v5.6.1"}], "defaultStatus": "unaffected"}, {"vendor": "Pyramid Solutions", "product": "EtherNet/IP Scanner Development Kit (ESDK)", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "v5.6.1", "versionType": "custom"}, {"status": "unaffected", "version": "v5.6.1"}], "defaultStatus": "unaffected"}, {"vendor": "Pyramid Solutions", "product": "EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE)", "versions": [{"status": "affected", "version": "0", "lessThan": "v5.6.1", "versionType": "custom"}, {"status": "unaffected", "version": "v5.6.1"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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."}]}], "references": [{"url": "https://pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-ethernet-ip-stack-explicit-messages/"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "CRITICAL", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.3, "vectorString": "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"}}], "solutions": [{"lang": "en", "value": "[NetStaX v5.6.1](https://pyramidsolutions.com/my-account/) 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. \n\nFor 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/)", "supportingMedia": [{"type": "text/html", "base64": false, "value": "[NetStaX v5.6.1](https://pyramidsolutions.com/my-account/) 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. <br><br>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/)"}]}], "credits": [{"lang": "en", "value": "Pyramid Solutions reported this vulnerability to CISA.", "type": "finder"}], "source": {"discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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