CVE-2023-27396

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-06-19. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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)

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
69.4%
KEV
Not listed

Published

June 19, 2023

Last Modified

December 24, 2024

Advisory Details (3)

Auto-updated Jul 6, 2026
Patch available. Sources: cisa.
cisa Patch Available

Omron SYSMAC CS/CJ/CP Series and NJ/NX Series | CISA

https://www.cisa.gov/uscert/ics/advisories/icsa-22-179-02
generic

JVNTA#91513661: FINSプロトコルにおけるセキュリティ上の問題について

https://jvn.jp/ta/JVNTA91513661/
generic

JVNTA#91513661: Security Issues in FINS protocol

https://jvn.jp/en/ta/JVNTA91513661/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 106 total refreshes for this CVE.

  1. 2026-07-25 14:16 UTCEPSS rescore
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  3. 2026-07-23 14:16 UTCEPSS rescore
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  5. 2026-07-23 02:20 UTCEG score recompute
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Frequently asked(5)

What is CVE-2023-27396?
CVE-2023-27396 is a critical vulnerability published on June 19, 2023. 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 --…
When was CVE-2023-27396 disclosed?
CVE-2023-27396 was first published in the National Vulnerability Database on June 19, 2023, with the most recent update on December 24, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-27396 actively exploited?
CVE-2023-27396 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 69.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-27396?
CVE-2023-27396 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-27396?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-27396, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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