CVE-2023-0811

Name: CVE-2023-0811
Creator: NVD / NIST
Published: 2023-03-16T18:15:11.16+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2023-0811 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Omron CJ1M unit v4.0 and prior has improper access controls on the memory region where the UM password is stored. If an adversary issues a PROGRAM AREA WRITE command to a specific memory region, they could overwrite the password. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

Description

Omron CJ1M unit v4.0 and prior has improper access controls on the memory region where the UM password is stored. If an adversary issues a PROGRAM AREA WRITE command to a specific memory region, they could overwrite the password. This may lead to disabling UM protections or setting a non-ASCII password (non-keyboard characters) and preventing an engineer from viewing or modifying the user program.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS Probability

0.62%

45.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Omron	Sysmac Cj2h-Cpu64 Firmware	All versions
Omron	Sysmac Cj2h-Cpu64-Eip Firmware	All versions
Omron	Sysmac Cj2h-Cpu65 Firmware	All versions
Omron	Sysmac Cj2h-Cpu65-Eip Firmware	All versions
Omron	Sysmac Cj2h-Cpu66 Firmware	All versions
Omron	Sysmac Cj2h-Cpu66-Eip Firmware	All versions
Omron	Sysmac Cj2h-Cpu67 Firmware	All versions
Omron	Sysmac Cj2h-Cpu67-Eip Firmware	All versions
Omron	Sysmac Cj2h-Cpu68 Firmware	All versions
Omron	Sysmac Cj2h-Cpu68-Eip Firmware	All versions
Omron	Sysmac Cj2m-Cpu11 Firmware	All versions
Omron	Sysmac Cj2m-Cpu12 Firmware	All versions
Omron	Sysmac Cj2m-Cpu13 Firmware	All versions
Omron	Sysmac Cj2m-Cpu14 Firmware	All versions
Omron	Sysmac Cj2m-Cpu15 Firmware	All versions
Omron	Sysmac Cj2m-Cpu31 Firmware	All versions
Omron	Sysmac Cj2m-Cpu32 Firmware	All versions
Omron	Sysmac Cj2m-Cpu33 Firmware	All versions
Omron	Sysmac Cj2m-Cpu34 Firmware	All versions
Omron	Sysmac Cj2m-Cpu35 Firmware	All versions
Omron	Sysmac Cp1e-E10dr-A Firmware	All versions
Omron	Sysmac Cp1e-E10dr-D Firmware	All versions
Omron	Sysmac Cp1e-E10dt-A Firmware	All versions
Omron	Sysmac Cp1e-E10dt-D Firmware	All versions
Omron	Sysmac Cp1e-E10dt1-A Firmware	All versions
Omron	Sysmac Cp1e-E10dt1-D Firmware	All versions
Omron	Sysmac Cp1e-E14dr-A Firmware	All versions
Omron	Sysmac Cp1e-E14sdr-A Firmware	All versions
Omron	Sysmac Cp1e-E20dr-A Firmware	All versions
Omron	Sysmac Cp1e-E20sdr-A Firmware	All versions
Omron	Sysmac Cp1e-E30dr-A Firmware	All versions
Omron	Sysmac Cp1e-E30sdr-A Firmware	All versions
Omron	Sysmac Cp1e-E40dr-A Firmware	All versions
Omron	Sysmac Cp1e-E40sdr-A Firmware	All versions
Omron	Sysmac Cp1e-E60sdr-A Firmware	All versions
Omron	Sysmac Cp1e-Na20dr-A Firmware	All versions
Omron	Sysmac Cp1e-Na20dt-D Firmware	All versions
Omron	Sysmac Cp1e-Na20dt1-D Firmware	All versions
Omron	Sysmac Cp1h-X40dr-A Firmware	All versions
Omron	Sysmac Cp1h-X40dt-D Firmware	All versions
Omron	Sysmac Cp1h-X40dt1-D Firmware	All versions
Omron	Sysmac Cp1h-Xa40dr-A Firmware	All versions
Omron	Sysmac Cp1h-Xa40dt-D Firmware	All versions
Omron	Sysmac Cp1h-Xa40dt1-D Firmware	All versions
Omron	Sysmac Cp1h-Y20dt-D Firmware	All versions
Omron	Sysmac Cp1l-El20dr-D Firmware	All versions
Omron	Sysmac Cp1l-Em30dr-D Firmware	All versions
Omron	Sysmac Cp1l-Em30dt-D Firmware	All versions
Omron	Sysmac Cp1l-Em30dt1-D Firmware	All versions
Omron	Sysmac Cp1l-Em40dr-D Firmware	All versions

Showing 50 of 128 affected configurations. See NVD for the full list.

References

https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-01Third Party Advisory, US Government Resource
https://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdfMitigation, Vendor Advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-01Third Party Advisory, US Government Resource
https://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdfMitigation, Vendor Advisory

Timeline

Published: Mar 16, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-0811?

How severe is CVE-2023-0811?

CVE-2023-0811 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2023-0811?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-0811?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST