CVE-2023-27396

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)

Published: 2023-06-19 Last update: 2024-12-24 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-27396 is rated High Risk (67.7/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.67%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-27396

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-19 1.95% 1.67% -0.28%
2 2026-04-15 1.83% 1.95% +0.12%
3 2026-03-14 — 1.83% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-27396

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-27396

Affected software / configurations for CVE-2023-27396

Vendor Product Version Raw CPE
omron cs1w-eip21_firmware — cpe:2.3:o:omron:cs1w-eip21_firmware:*:*:*:*:*:*:*:*
omron cs1w-spu01-v2_firmware — cpe:2.3:o:omron:cs1w-spu01-v2_firmware:*:*:*:*:*:*:*:*
omron cs1w-spu02-v2_firmware — cpe:2.3:o:omron:cs1w-spu02-v2_firmware:*:*:*:*:*:*:*:*
omron cs1w-etn21_firmware — cpe:2.3:o:omron:cs1w-etn21_firmware:*:*:*:*:*:*:*:*
omron cs1w-clk_firmware — cpe:2.3:o:omron:cs1w-clk_firmware:*:*:*:*:*:*:*:*
omron cs1w-fln22_firmware — cpe:2.3:o:omron:cs1w-fln22_firmware:*:*:*:*:*:*:*:*
omron cs1w-drm21-v1_firmware — cpe:2.3:o:omron:cs1w-drm21-v1_firmware:*:*:*:*:*:*:*:*
omron cs1w-nc271_firmware — cpe:2.3:o:omron:cs1w-nc271_firmware:-:*:*:*:*:*:*:*
omron cs1w-nc471_firmware — cpe:2.3:o:omron:cs1w-nc471_firmware:-:*:*:*:*:*:*:*
omron cs1w-ncf71_firmware — cpe:2.3:o:omron:cs1w-ncf71_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu35_firmware — cpe:2.3:o:omron:cj2m-cpu35_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu34_firmware — cpe:2.3:o:omron:cj2m-cpu34_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu33_firmware — cpe:2.3:o:omron:cj2m-cpu33_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu32_firmware — cpe:2.3:o:omron:cj2m-cpu32_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu31_firmware — cpe:2.3:o:omron:cj2m-cpu31_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu15_firmware — cpe:2.3:o:omron:cj2m-cpu15_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu14_firmware — cpe:2.3:o:omron:cj2m-cpu14_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu13_firmware — cpe:2.3:o:omron:cj2m-cpu13_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu12_firmware — cpe:2.3:o:omron:cj2m-cpu12_firmware:-:*:*:*:*:*:*:*
omron cj2m-cpu11_firmware — cpe:2.3:o:omron:cj2m-cpu11_firmware:-:*:*:*:*:*:*:*
omron cp1w-cif01_firmware — cpe:2.3:o:omron:cp1w-cif01_firmware:-:*:*:*:*:*:*:*
omron cp1w-cif11_firmware — cpe:2.3:o:omron:cp1w-cif11_firmware:-:*:*:*:*:*:*:*
omron cp1w-cif12-v1_firmware — cpe:2.3:o:omron:cp1w-cif12-v1_firmware:-:*:*:*:*:*:*:*
omron cj2m-md211_firmware — cpe:2.3:o:omron:cj2m-md211_firmware:-:*:*:*:*:*:*:*
omron cj2m-md212_firmware — cpe:2.3:o:omron:cj2m-md212_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu68-eip_firmware — cpe:2.3:o:omron:cj2h-cpu68-eip_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu67-eip_firmware — cpe:2.3:o:omron:cj2h-cpu67-eip_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu66-eip_firmware — cpe:2.3:o:omron:cj2h-cpu66-eip_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu65-eip_firmware — cpe:2.3:o:omron:cj2h-cpu65-eip_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu64-eip_firmware — cpe:2.3:o:omron:cj2h-cpu64-eip_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu68_firmware — cpe:2.3:o:omron:cj2h-cpu68_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu67_firmware — cpe:2.3:o:omron:cj2h-cpu67_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu66_firmware — cpe:2.3:o:omron:cj2h-cpu66_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu65_firmware — cpe:2.3:o:omron:cj2h-cpu65_firmware:-:*:*:*:*:*:*:*
omron cj2h-cpu64_firmware — cpe:2.3:o:omron:cj2h-cpu64_firmware:-:*:*:*:*:*:*:*
omron cp2e-n14dr-a_firmware — cpe:2.3:o:omron:cp2e-n14dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n14dt-a_firmware — cpe:2.3:o:omron:cp2e-n14dt-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n14dr-d_firmware — cpe:2.3:o:omron:cp2e-n14dr-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n14dt-d_firmware — cpe:2.3:o:omron:cp2e-n14dt-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n14dt1-d_firmware — cpe:2.3:o:omron:cp2e-n14dt1-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n20dr-a_firmware — cpe:2.3:o:omron:cp2e-n20dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n20dt-a_firmware — cpe:2.3:o:omron:cp2e-n20dt-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n20dr-d_firmware — cpe:2.3:o:omron:cp2e-n20dr-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n20dt-d_firmware — cpe:2.3:o:omron:cp2e-n20dt-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n20dt1-d_firmware — cpe:2.3:o:omron:cp2e-n20dt1-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n30dr-a_firmware — cpe:2.3:o:omron:cp2e-n30dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n30dt-a_firmware — cpe:2.3:o:omron:cp2e-n30dt-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n30dr-d_firmware — cpe:2.3:o:omron:cp2e-n30dr-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n30dt-d_firmware — cpe:2.3:o:omron:cp2e-n30dt-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n30dt1-d_firmware — cpe:2.3:o:omron:cp2e-n30dt1-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n40dr-a_firmware — cpe:2.3:o:omron:cp2e-n40dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n40dt-a_firmware — cpe:2.3:o:omron:cp2e-n40dt-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n40dr-d_firmware — cpe:2.3:o:omron:cp2e-n40dr-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n40dt-d_firmware — cpe:2.3:o:omron:cp2e-n40dt-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n40dt1-d_firmware — cpe:2.3:o:omron:cp2e-n40dt1-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n60dr-a_firmware — cpe:2.3:o:omron:cp2e-n60dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n60dt-a_firmware — cpe:2.3:o:omron:cp2e-n60dt-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-n60dr-d_firmware — cpe:2.3:o:omron:cp2e-n60dr-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n60dt-d_firmware — cpe:2.3:o:omron:cp2e-n60dt-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-n60dt1-d_firmware — cpe:2.3:o:omron:cp2e-n60dt1-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-s30dr-a_firmware — cpe:2.3:o:omron:cp2e-s30dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-s30dt-d_firmware — cpe:2.3:o:omron:cp2e-s30dt-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-s30dt1-d_firmware — cpe:2.3:o:omron:cp2e-s30dt1-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-s40dr-a_firmware — cpe:2.3:o:omron:cp2e-s40dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-s40dt-d_firmware — cpe:2.3:o:omron:cp2e-s40dt-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-s40dt1-d_firmware — cpe:2.3:o:omron:cp2e-s40dt1-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-s60dr-a_firmware — cpe:2.3:o:omron:cp2e-s60dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-s60dt-d_firmware — cpe:2.3:o:omron:cp2e-s60dt-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-s60dt1-d_firmware — cpe:2.3:o:omron:cp2e-s60dt1-d_firmware:-:*:*:*:*:*:*:*
omron cp2e-e14dr-a_firmware — cpe:2.3:o:omron:cp2e-e14dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-e20dr-a_firmware — cpe:2.3:o:omron:cp2e-e20dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-e30dr-a_firmware — cpe:2.3:o:omron:cp2e-e30dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-e40dr-a_firmware — cpe:2.3:o:omron:cp2e-e40dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2e-e60dr-a_firmware — cpe:2.3:o:omron:cp2e-e60dr-a_firmware:-:*:*:*:*:*:*:*
omron cp2w-cifd1_firmware — cpe:2.3:o:omron:cp2w-cifd1_firmware:-:*:*:*:*:*:*:*
omron cp2w-cifd2_firmware — cpe:2.3:o:omron:cp2w-cifd2_firmware:-:*:*:*:*:*:*:*
omron cp2w-cifd3_firmware — cpe:2.3:o:omron:cp2w-cifd3_firmware:-:*:*:*:*:*:*:*
omron cp1w-adb21_firmware — cpe:2.3:o:omron:cp1w-adb21_firmware:-:*:*:*:*:*:*:*
omron cp1w-dab21v_firmware — cpe:2.3:o:omron:cp1w-dab21v_firmware:-:*:*:*:*:*:*:*
omron cp1w-mab221_firmware — cpe:2.3:o:omron:cp1w-mab221_firmware:-:*:*:*:*:*:*:*

References for CVE-2023-27396

URL Tags
https://jvn.jp/en/ta/JVNTA91513661/ Third Party Advisory
https://jvn.jp/ta/JVNTA91513661/ Third Party Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-22-179-02 Not Applicable Third Party Advisory US Government Resource
https://www.fa.omron.co.jp/product/vulnerability/OMSR-2023-003_ja.pdf Vendor Advisory
https://www.ia.omron.com/product/vulnerability/OMSR-2023-003_en.pdf Vendor Advisory
https://www.us-cert.gov/ics/advisories/icsa-19-346-02 Not Applicable Third Party Advisory US Government Resource
https://www.us-cert.gov/ics/advisories/icsa-20-063-03 Not Applicable Third Party Advisory US Government Resource
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