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Fencer Vulns
critical 9.8

CVE-2022-31207 json

The Omron SYSMAC Cx product family PLCs (CS series, CJ series, and CP series) through 2022-05-18 lack cryptographic authentication.

published 2022-07-26 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-52791

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

Summary

The Omron SYSMAC Cx product family PLCs (CS series, CJ series, and CP series) through 2022-05-18 lack cryptographic authentication. They utilize the Omron FINS (9600/TCP) protocol for engineering purposes, including downloading projects and control logic to the PLC. This protocol has authentication flaws as reported in FSCT-2022-0057. Control logic is downloaded to PLC volatile memory using the FINS Program Area Read and Program Area Write commands or to non-volatile memory using other commands from where it can be loaded into volatile memory for execution. The logic that is loaded into and executed from the user program area exists in compiled object code form. Upon execution, these object codes are first passed to a dedicated ASIC that determines whether the object code is to be executed by the ASIC or the microprocessor. In the former case, the object code is interpreted by the ASIC whereas in the latter case the object code is passed to the microprocessor for object code interpretation by a ROM interpreter. In the abnormal case where the object code cannot be handled by either, an abnormal condition is triggered and the PLC is halted. The logic that is downloaded to the PLC does not seem to be cryptographically authenticated, thus allowing an attacker to manipulate transmitted object code to the PLC and either execute arbitrary object code commands on the ASIC or on the microprocessor interpreter.

Patch / fix

  • omron sysmac_cs1_firmware 4.1
  • omron sysmac_cj2m_firmware 2.1
  • omron sysmac_cj2h_firmware 1.5
  • omron sysmac_cp1e_firmware 1.30
  • omron sysmac_cp1h_firmware 1.30
  • omron sysmac_cp1l_firmware 1.10

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-22-179-02 updated cvss 5.9

Omron SYSMAC CS/CJ/CP Series and NJ/NX Series

  • Omron CP1W-CIF41 Omron SYSMAC CJ2H < 1.5 Omron SYSMAC CJ2M < 2.1 Omron SYSMAC CP1E/CP1H < 1.30 Omron SYSMAC CP1L < 1.10 Omron SYSMAC CS1H/CJ1G < 4.1
    +2 more products
    Omron SYSMAC CX-Programmer < 9.6 Omron SYSMAC NJ/NX Series < 1.49 (1.29 for NX7)
    affected: mitigation

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.00% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.