CVE-2026-78012CWE-121

CVE-2026-78012

Critical · published September 1, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
50.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
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
EPSS
0.00649 · 50.5th percentile
Weakness
CWE-121 · Stack-based Buffer Overflow
Published
2026-09-01T19:17Z
References (3)
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-246-07.json · [email protected]https://pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-ethernet-ip-stack-explicit-messages/ · [email protected]https://www.cisa.gov/news-events/ics-advisories/icsa-26-246-07 · [email protected]
EPSS history
Timeline
  • 03 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 01 SEP 15:01Z
    Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack
    cvelistv5