CVE-2026-78012 (GCVE-0-2026-78012)

Vulnerability from cvelistv5 – Published: 2026-09-01 15:01 – Updated: 2026-09-04 21:05
VLAI
Title
Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack
Summary
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.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 15:26 UTC
CWE
Assigner
icscert CNA under the icscert root
CNA scorecard B 75/100 over 343 records in the last 180 days details
Show details on NVD website

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              "product": "EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE)",
              "vendor": "Pyramid Solutions",
              "versions": [
                {
                  "lessThanOrEqual": "v5.6.1",
                  "status": "affected",
                  "version": "0",
                  "versionType": "custom"
                },
                {
                  "status": "unaffected",
                  "version": "v5.6.1"
                }
              ]
            },
            {
              "defaultStatus": "unaffected",
              "product": "EtherNet/IP Scanner Development Kit (ESDK)",
              "vendor": "Pyramid Solutions",
              "versions": [
                {
                  "lessThanOrEqual": "v5.6.1",
                  "status": "affected",
                  "version": "0",
                  "versionType": "custom"
                },
                {
                  "status": "unaffected",
                  "version": "v5.6.1"
                }
              ]
            },
            {
              "defaultStatus": "unaffected",
              "product": "EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE)",
              "vendor": "Pyramid Solutions",
              "versions": [
                {
                  "lessThan": "v5.6.1",
                  "status": "affected",
                  "version": "0",
                  "versionType": "custom"
                },
                {
                  "status": "unaffected",
                  "version": "v5.6.1"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Pyramid Solutions reported this vulnerability to CISA."
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "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."
                }
              ],
              "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."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            },
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 9.3,
                "baseSeverity": "CRITICAL",
                "exploitMaturity": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "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",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-121",
                  "description": "CWE-121",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-04T21:05:12.277Z",
            "orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6",
            "shortName": "icscert"
          },
          "references": [
            {
              "url": "https://pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-ethernet-ip-stack-explicit-messages/"
            },
            {
              "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-246-07"
            },
            {
              "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-246-07.json"
            }
          ],
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              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eNetStaX 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.\u003cbr\u003e\u003ca href=\"https://pyramidsolutions.com/my-account/\"\u003ehttps://pyramidsolutions.com/my-account/\u003c/a\u003e\u003cbr\u003eFor more information, see the Pyramid Solutions blog post \"NetStaX v5.6.1: Protecting Against Silent Buffer Overflow in Ethernet/IP Stack Explicit Messages\".\u003cbr\u003e\u003ca href=\"https://pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-ethernet-ip-stack-explicit-messages/\"\u003ehttps://pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-ethernet-ip-stack-explicit-messages/\u003c/a\u003e\u003c/p\u003e"
                }
              ],
              "value": "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.\n https://pyramidsolutions.com/my-account/ \nFor more information, see the Pyramid Solutions blog post \"NetStaX v5.6.1: Protecting Against Silent Buffer Overflow in Ethernet/IP Stack Explicit Messages\".\n https://pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-ethernet-ip-stack-explicit-messages/"
            }
          ],
          "source": {
            "advisory": "ICSA-26-246-07",
            "discovery": "INTERNAL"
          },
          "title": "Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack",
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      },
      "cveMetadata": {
        "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6",
        "assignerShortName": "icscert",
        "cveId": "CVE-2026-78012",
        "datePublished": "2026-09-01T15:01:49.064Z",
        "dateReserved": "2026-08-21T22:15:28.774Z",
        "dateUpdated": "2026-09-04T21:05:12.277Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.