Public proof of concept

CVE-2026-75352

Integer Underflow in OpENer EtherNet/IP ForwardOpen Parser Enables Remote DoS

A public proof of concept exists; no exploitation attested.

Published2026-10-09
WeaknessCWE-191

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC

2026-10-0919:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-75352?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-75352?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2026-75352 Red Hat Product Security
OpENer: OpENer: Denial of Service via integer underflow in connection-path parser

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionpoc2026-10-13
OpenCVESSVC decisionpoc—
CISA-ADPCVSS 3.17.52026-10-13
CISA-ADPweakness (CWE)CWE-1912026-10-13
FIRST EPSSEPSS score0.3 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-10-09
Last Modified: 2026-10-16
NVD status: Awaiting Analysis

Frequently asked questions

What is CVE-2026-75352?

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

Is CVE-2026-75352 actively exploited?

A proof-of-concept exploit exists for CVE-2026-75352, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-75352?

CVE-2026-75352 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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