CVE-2023-0811

criticalpriority · track · 36EPSS 0.006 · 50 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.62% (50th) EPSS

CVSS 9.1 · critical

Is it mine?

180 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-28

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCJ1G-CPU □ □ Pcisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCJ2H-CPU6 □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCJ2H-CPU6 □ -EIPcisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCJ2M-CPU □ □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP1E-E □ □ D □ - □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP1E-NA □ □ D □ - □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP1H-X40D □ - □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP1H-XA40D □ - □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP1H-Y20DT-Dcisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP1L-EL20D □ - □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP1L-EM □ □ D □ - □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP1L-L □ □ D □- □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP1L-M □ □ D □ - □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP2E-E □ □ D □ - □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP2E-N □ □ D □ - □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCP2E-S □ □ D □- □cisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCS1D-CPU □ □ Hcisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCS1D-CPU □ □ HAcisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCS1D-CPU □ □ Pcisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCS1D-CPU □ □ Scisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCS1D-CPU □ □ SAcisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCS1G-CPU □ □ Hcisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.
FixedCS1H-CPU □ □ Hcisa_csaf_ot
Anti-virus protection: Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection.

cvss

Technical severity, 0–10. One row per scoring source.

9.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.3–9.1

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.2

v3.09.1criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hsecondary · CISA US

v3.19.1criticalAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hsecondary · ENISA EU

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hsecondary · ics-cert@hq.dhs.gov USexploitability 3.9 · impact 5.2

v3.18.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-284USCWE-284USCWE-284US

affected products (180)

Products and version ranges known to be affected.

CJ1G-CPU □ □ P: All versionsall versionscisa_csaf_otUS
CJ2H-CPU6 □ -EIP: All versionsall versionscisa_csaf_otUS
CJ2H-CPU6 □: All versionsall versionscisa_csaf_otUS
CJ2M-CPU □ □: All versionsall versionscisa_csaf_otUS
CP1E-E □ □ D □ - □: All versionsall versionscisa_csaf_otUS
CP1E-NA □ □ D □ - □: All versionsall versionscisa_csaf_otUS
CP1H-X40D □ - □: All versionsall versionscisa_csaf_otUS
CP1H-XA40D □ - □: All versionsall versionscisa_csaf_otUS
CP1H-Y20DT-D: All versionsall versionscisa_csaf_otUS
CP1L-EL20D □ - □: All versionsall versionscisa_csaf_otUS
CP1L-EM □ □ D □ - □: All versionsall versionscisa_csaf_otUS
CP1L-L □ □ D □- □: All versionsall versionscisa_csaf_otUS
CP1L-M □ □ D □ - □: All versionsall versionscisa_csaf_otUS
CP2E-E □ □ D □ - □: All versionsall versionscisa_csaf_otUS
CP2E-N □ □ D □ - □: All versionsall versionscisa_csaf_otUS
CP2E-S □ □ D □- □: All versionsall versionscisa_csaf_otUS
CS1D-CPU □ □ H: All versionsall versionscisa_csaf_otUS
CS1D-CPU □ □ HA: All versionsall versionscisa_csaf_otUS
CS1D-CPU □ □ P: All versionsall versionscisa_csaf_otUS
CS1D-CPU □ □ S: All versionsall versionscisa_csaf_otUS

showing 20 of 180

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-23-073-01Omron CJ1M PLC2023-03-31icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities could allow an attacker to bypass user memory protections by writing to a specific memory address. An attacker can also overwrite passwords and lock engineers from reading their own memory regions.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot NVD CVE.org MITRE

published 2023-03-16modified 2026-06-17

references (9)

External citations — patches, advisories, analysis.

scry

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