CVE-2023-22357Network attack vector

Unauthenticated code execution via undocumented FINS command

Published Jan 17, 2023 · Updated Apr 4, 2025

Active debug code in OMRON CP1L-EL20DR-D all versions allows remote attackers to execute code via an unauthenticated FINS command. The controller accepts a command absent from the FINS specification without authentication, exposing arbitrary device-memory reads and writes. Network access to FINS port 9600 is sufficient; memory writes can overwrite firmware, interrupt controller service, or run arbitrary code.

CVSS severity9.1
Critical
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Active debug code in OMRON CP1L-EL20DR-D all versions allows remote attackers to execute code via an unauthenticated FINS command. The controller accepts a command absent from the FINS specification without authentication, exposing arbitrary device-memory reads and writes. Network access to FINS port 9600 is sufficient; memory writes can overwrite firmware, interrupt controller service, or run arbitrary code.

The record

CVE
CVE-2023-22357
Published
Jan 17, 2023
Updated
Apr 4, 2025
Vendor
OMRON Corporation
Product
CP1L-EL20DR-D
Classifications
CWE-489, T0866
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OMRON Corporation · CP1L-EL20DR-Dversion=All versions

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.1OMRON CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-489Active Debug Code
T0866Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo