CVE-2023-27396

What it is

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)

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

1.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2023-06-19 05:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 05:44 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.4% in the next 30 days (EPSS).
• Severity: 9.8 CRITICAL (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-06-19 05:15 UTC

Last modified

2026-06-17 05:44 UTC

Exploit probability

1.4% · EPSS, next 30 days

Weakness

CWE-306 · Missing authentication

Record status

Modified

Affected

• Omron cs1w-eip21 Firmware
• Omron cs1w-spu01-v2 Firmware
• Omron cs1w-spu02-v2 Firmware
• Omron cs1w-etn21 Firmware
• Omron cs1w-clk Firmware
• Omron cs1w-fln22 Firmware
• Omron cs1w-drm21-v1 Firmware
• Omron cs1w-nc271 Firmware

Attack profile CVSS 3.1 · 9.8

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-27396.md and follow it. Check whether this project is affected by CVE-2023-27396. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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