CVE-2023-0811

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.

Published: 2023-03-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-0811 is rated Moderate Risk (54.6/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.28%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-0811

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-15 0.16% 0.28% +0.12%
2 2026-04-03 0.11% 0.16% +0.05%
3 2026-03-16 — 0.11% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-0811

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]

Weakness enumeration for CVE-2023-0811

Affected software / configurations for CVE-2023-0811

Vendor Product Version Raw CPE
omron sysmac_cj2h-cpu64_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu64_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2h-cpu64-eip_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu64-eip_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2h-cpu65_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu65_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2h-cpu65-eip_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu65-eip_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2h-cpu66_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu66_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2h-cpu66-eip_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu66-eip_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2h-cpu67_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu67_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2h-cpu67-eip_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu67-eip_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2h-cpu68_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu68_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2h-cpu68-eip_firmware — cpe:2.3:o:omron:sysmac_cj2h-cpu68-eip_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu11_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu11_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu12_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu12_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu13_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu13_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu14_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu14_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu15_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu15_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu31_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu31_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu32_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu32_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu33_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu33_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu34_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu34_firmware:-:*:*:*:*:*:*:*
omron sysmac_cj2m-cpu35_firmware — cpe:2.3:o:omron:sysmac_cj2m-cpu35_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e10dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e10dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e10dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1e-e10dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e10dt-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e10dt-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e10dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1e-e10dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e10dt1-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e10dt1-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e10dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1e-e10dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e14dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e14dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e14sdr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e14sdr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e20dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e20dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e20sdr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e20sdr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e30dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e30dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e30sdr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e30sdr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e40dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e40dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e40sdr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e40sdr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-e60sdr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-e60sdr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-na20dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1e-na20dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-na20dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1e-na20dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1e-na20dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1e-na20dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1h-x40dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1h-x40dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1h-x40dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1h-x40dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1h-x40dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1h-x40dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1h-xa40dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1h-xa40dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1h-xa40dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1h-xa40dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1h-xa40dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1h-xa40dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1h-y20dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1h-y20dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-el20dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-el20dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-em30dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-em30dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-em30dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-em30dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-em30dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-em30dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-em40dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-em40dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-em40dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-em40dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-em40dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-em40dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l10dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-l10dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l10dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-l10dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l10dt-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-l10dt-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l10dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-l10dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l10dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-l10dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l14dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-l14dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l14dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-l14dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l14dt-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-l14dt-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l14dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-l14dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l14dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-l14dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l20dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-l20dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l20dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-l20dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l20dt-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-l20dt-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l20dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-l20dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-l20dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-l20dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m30dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-m30dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m30dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-m30dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m30dt-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-m30dt-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m30dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-m30dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m30dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-m30dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m40dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-m40dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m40dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-m40dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m40dt-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-m40dt-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m40dt-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-m40dt-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m40dt1-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-m40dt1-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m60dr-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-m60dr-a_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m60dr-d_firmware — cpe:2.3:o:omron:sysmac_cp1l-m60dr-d_firmware:-:*:*:*:*:*:*:*
omron sysmac_cp1l-m60dt-a_firmware — cpe:2.3:o:omron:sysmac_cp1l-m60dt-a_firmware:-:*:*:*:*:*:*:*

References for CVE-2023-0811

cvelogic Threat Intelligence