---
id: CVE-2026-75352
title: >-
  OpENer v2.3/commit 76b95cf, contains an integer underflow in the server-side
  EtherNet/IP ForwardOpen connection-path parser
summary: >-
  OpENer v2.3/commit 76b95cf, contains an integer underflow in the server-side
  EtherNet/IP ForwardOpen connection-path parser. This allows a remote attacker
  to cause a denial of service
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-191
vendor: Red Hat
published: '2026-10-09'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:16:41.300'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75352'
references:
  - url: 'https://github.com/EIPStackGroup/OpENer'
    label: cve@mitre.org
  - url: 'https://github.com/EIPStackGroup/OpENer/issues/571'
    label: cve@mitre.org
  - url: 'https://github.com/EIPStackGroup/OpENer/issues/571'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75352.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-75352'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-75352'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - exploit-available
epss: 0.00396
epssPercentile: 0.33586
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-13T10:59:37.974359Z'
ingestedAt: '2026-10-09T20:11:26.052Z'
---

## Overview

OpENer v2.3/commit 76b95cf, contains an integer underflow in the server-side EtherNet/IP ForwardOpen connection-path parser. This allows a remote attacker to cause a denial of service

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75352.json)