No exploitation reported

CVE-2023-27396

No exploitation reported by the sources we read.

Published2023-06-19
WeaknessCWE-306

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

FINS (Factory Interface Network Service) is a message communication protocol, which is designed to be used in closed FA (Factory Automation) networks, and is used in FA networks composed of OMRON products. Multiple OMRON products that implement FINS protocol contain following security issues -- (1)Plaintext communication, and (2)No authentication required. When FINS messages are intercepted, the contents may be retrieved. When arbitrary FINS messages are injected, any commands may be executed on, or the system information may be retrieved from, the affected device. Affected products and versions are as follows: SYSMAC CS-series CPU Units, all versions, SYSMAC CJ-series CPU Units, all versions, SYSMAC CP-series CPU Units, all versions, SYSMAC NJ-series CPU Units, all versions, SYSMAC NX1P-series CPU Units, all versions, SYSMAC NX102-series CPU Units, all versions, and SYSMAC NX7 Database Connection CPU Units (Ver.1.16 or later)

Timeline

dates in UTC

2023-06-1905:15CVE 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-2023-27396?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-27396?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Omron cj2h-cpu64 firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Omron cj2h-cpu64-eip firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Omron cj2h-cpu65 firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

268 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

www.fa.omron.co.jpVendor Advisory
www.ia.omron.comVendor Advisory

Detection

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

Sources

CISA-ADPSSVC decisionnone2024-12-24
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.19.82024-12-24
NVDCVSS 3.19.8read 2026-10-23
CISA-ADPweakness (CWE)CWE-3062024-12-24
NVDweakness (CWE)CWE-306read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2023-06-19
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-27396?

Is CVE-2023-27396 actively exploited?

Active exploitation of CVE-2023-27396 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-27396?

CVE-2023-27396 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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