HOMEVULNERABILITIESCVE-2023-38744
HIGH

CVE-2023-38744

NVD-CWE-OtherPublished: August 3, 2023· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-38744 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

omron24 product(s)
cj2m-cpu35 firmwarecj2m-cpu35cj2m-cpu34 firmwarecj2m-cpu34cj2m-cpu33 firmwarecj2m-cpu33cj2m-cpu32 firmwarecj2m-cpu32cj2m-cpu31 firmwarecj2m-cpu31cj2h-cpu68-eip firmwarecj2h-cpu68-eip+12
Source: NVD CPE · 24 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://jvn.jp/en/vu/JVNVU92193064/
ADVISORYhttps://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdf
ADVISORYhttps://jvn.jp/en/vu/JVNVU92193064/
ADVISORYhttps://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdf

All References (4)

→
https://jvn.jp/en/vu/JVNVU92193064/Third Party Advisory
→
https://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdfVendor Advisory
→
https://jvn.jp/en/vu/JVNVU92193064/Third Party Advisory
→
https://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdfVendor Advisory

Quick Facts

CVE IDCVE-2023-38744
CVSS Score7.5 / 10
SeverityHIGH
WeaknessNVD-CWE-Other
CISA KEVNo
Affected1 vendor(s)
PublishedAug 3, 2023

Related CVEs (NVD-CWE-Other)

CVE-2005-1740
10.0
CVE-2005-3666
10.0
CVE-2005-1693
10.0
CVE-2005-1738
10.0
CVE-2005-1256
10.0
CVE-2005-1897
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-38744 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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