{"cve":"CVE-2023-38744","nvd":{"published":"2023-08-03T05:15:10.417","modified":"2026-06-17T06:11:05.203","status":"Modified","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 of the CS/CJ Series EtherNet/IP unit. If an affected product receives a packet which is specially crafted by a remote unauthenticated attacker, the unit of the affected product may fall into a denial-of-service (DoS) condition. Affected products/versions are as follows: CJ2M CPU Unit CJ2M-CPU3[] Unit version of the built-in EtherNet/IP section Ver. 2.18 and earlier, CJ2H CPU Unit CJ2H-CPU6[]-EIP Unit version of the built-in EtherNet/IP section Ver. 3.04 and earlier, CS/CJ Series EtherNet/IP Unit CS1W-EIP21 V3.04 and earlier, and CS/CJ Series EtherNet/IP Unit CJ1W-EIP21 V3.04 and earlier.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-1284"],"references":["https://jvn.jp/en/vu/JVNVU92193064/","https://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdf","https://jvn.jp/en/vu/JVNVU92193064/","https://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdf"],"products":["omron:cj1w-eip21_firmware","omron:cj2h-cpu64-eip_firmware","omron:cj2h-cpu65-eip_firmware","omron:cj2h-cpu66-eip_firmware","omron:cj2h-cpu67-eip_firmware","omron:cj2h-cpu68-eip_firmware","omron:cj2m-cpu31_firmware","omron:cj2m-cpu32_firmware","omron:cj2m-cpu33_firmware","omron:cj2m-cpu34_firmware","omron:cj2m-cpu35_firmware","omron:cs1w-eip21_firmware"],"source":"nvd","synced_at":"2026-10-19T21:38:35.729974749+00:00"},"epss":{"cve":"CVE-2023-38744","score":0.00866,"percentile":0.58706,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}