CVE-2026-78012Network attack vector

Remote memory corruption via unchecked explicit-message copy

Published Sep 1, 2026 · Updated Sep 1, 2026

Stack-based buffer overflow in Pyramid Solutions NetStaX before 5.6.1 allows remote attackers to corrupt memory or crash devices. routerParseObjectRequest() copies a Class 3 explicit-message payload admitted up to MAX_DATA_FIELD_SIZE into requestData[MAX_REQUEST_DATA_SIZE] without verifying that the destination is large enough. Exploitation requires network reachability to the EtherNet/IP endpoint, and a successful oversized request can corrupt adjacent memory or interrupt the embedded device through a crash.

CVSS severity9.8
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Pyramid Solutions NetStaX before 5.6.1 allows remote attackers to corrupt memory or crash devices. routerParseObjectRequest() copies a Class 3 explicit-message payload admitted up to MAX_DATA_FIELD_SIZE into requestData[MAX_REQUEST_DATA_SIZE] without verifying that the destination is large enough. Exploitation requires network reachability to the EtherNet/IP endpoint, and a successful oversized request can corrupt adjacent memory or interrupt the embedded device through a crash.

The record

CVE
CVE-2026-78012
Published
Sep 1, 2026
Updated
Sep 1, 2026
Vendor
Pyramid Solutions
Product
EtherNet/IP Adapter Development Kit
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=v5.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pyramid Solutions · EtherNet/IP Adapter Development Kitversion=0 <=v5.6.1
Pyramid Solutions · EtherNet/IP Adapter DLL Kit with CIP Securityversion=0 <=v5.6.1
Pyramid Solutions · EtherNet/IP Scanner Development Kit with CIP Securityversion=0 <v5.6.1
Pyramid Solutions · EtherNet/IP Scanner DLL Kit with CIP Securityversion=0 <=v5.6.1
Pyramid Solutions · EtherNet/IP Scanner Development Kitversion=0 <=v5.6.1
Pyramid Solutions · EtherNet/IP Adapter Development Kit with CIP Securityversion=0 <=v5.6.1
Pyramid Solutions · EtherNet/IP Scanner DLL Kitversion=0 <=v5.6.1
Pyramid Solutions · EtherNet/IP Adapter DLL Kitversion=0 <=v5.6.1

Published CVSS scores

9.3CISA ICS-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8CISA ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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