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Fencer Vulns
critical 9.8

CVE-2026-78012 json

Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack

published 2026-09-01 2 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-69384

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

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.

Patch / fix

  • 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

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-26-246-07 updated cvss 9.8

Pyramid Solutions NetStaX EtherNet/IP Stack

  • 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 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 Scanner Development Kit (ESDK) <v5.6.1 Pyramid Solutions EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE) <v5.6.1
    +2 more products
    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
    affected: 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".” pyramidsolutions.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.65% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 9.3 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
CNA 4.0 9.3 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • 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)

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.