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01 Record

CVE-2023-38744

Denial-of-service (DoS) vulnerability due to improper validation of specified type of input issue exists in the built-in EtherNet/IP port of the CJ Series CJ2 CPU unit and the communication function

UnratedPUBLISHEDCNA: jpcert
CNA base scoreUnratedNo CNA CVSS vector

02 Description

Denial-of-service (DoS) vulnerability due to improper validation of specified type of input issue exists in the built-in EtherNet/IP port of the CJ Series CJ2 CPU unit and the communication function

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.86% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 58.3% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-08-03 04:55Z3 YR AGO
Last updated
2024-10-17 15:17Z2 YR AGO
Reserved
2023-07-25
Assigning CNA
jpcert
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-1284Improper Validation of Specified Quantity in InputBase
Data version
5.1
Document digest
81ebf48fcf76a8eccf643eba5c106da3084bbdfa1e57e45f05f3a9a1919cb9f6

05 Affected products

VendorProductVersionsPlatforms
OMRON CorporationCJ2M CPU UnitCJ2M-CPU3[] Unit version of the built-in EtherNet/IP section Ver. 2.18 and earlier—
OMRON CorporationCJ2H CPU UnitCJ2H-CPU6[]-EIP Unit version of the built-in EtherNet/IP section Ver. 3.04 and earlier—
OMRON CorporationCS/CJ Series EtherNet/IP UnitCS1W-EIP21 V3.04 and earlier, CJ1W-EIP21 V3.04 and earlier—
omroncj2m_cpu_unit0 to < 2.18—
omroncj2h_cpu_unit0 to < 3.04—
omroncs_cj_series_ethernet_ip_unit0 to < CS1W-EIP21 V3.04, 0 to < CJ1W-EIP21 V3.04—

06 References