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Fencer Vulns
critical 9.8

CVE-2022-29958 json

JTEKT TOYOPUC PLCs through 2022-04-29 do not ensure data integrity.

published 2022-07-26 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-34265

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

JTEKT TOYOPUC PLCs through 2022-04-29 do not ensure data integrity. They utilize the unauthenticated CMPLink/TCP protocol for engineering purposes, including downloading projects and control logic to the PLC. Control logic is downloaded to the PLC on a block-by-block basis with a given memory address and a blob of machine code. The logic that is downloaded to the PLC is not cryptographically authenticated, allowing an attacker to execute arbitrary machine code on the PLC's CPU module in the context of the runtime. In the case of the PC10G-CPU, and likely for other CPU modules of the TOYOPUC family, a processor without MPU or MMU is used and this no memory protection or privilege-separation capabilities are available, giving an attacker full control over the CPU.

Vendor advisories

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

cisa ICSA-22-172-02 updated cvss 7.7

JTEKT TOYOPUC

  • JTEKT Corporation Nano 10GX Type=TUC-1157 JTEKT Corporation Nano CPU Type=TUC-6941 JTEKT Corporation PC3JX Type=TCC-6901 JTEKT Corporation PC3JX-D Type=TCC-6902 JTEKT Corporation PC10B Type=TCC-1021 JTEKT Corporation PC10B-P Type=TCC-6373
    +11 more products
    JTEKT Corporation PC10E Type=TCC-4737 JTEKT Corporation PC10EL Type=TCC-4747 JTEKT Corporation PC10G-CPU Type=TCC-6353 JTEKT Corporation PC10GE Type=TCC-6464 JTEKT Corporation PC10P Type=TCC-6372 JTEKT Corporation PC10P-DP Type=TCC-6726 JTEKT Corporation PC10P-DP-IO Type=TCC-6752 JTEKT Corporation PC10PE Type=TCC-1101 JTEKT Corporation PC10PE-1616P Type=TCC-1102 JTEKT Corporation PCDL Type=TKC-6688 JTEKT Corporation Plus CPU Type=TCC-6740
    affected: mitigation “Locate control system networks and remote devices behind firewalls and isolate them from the business network.”

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

0.61% chance of exploitation in the next 30 days, higher than 49% 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-345 Insufficient Verification of Data Authenticity

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.