CVE-2021-27458· NVD / CVE Program· CNA icscert

If Ethernet communication of the JTEKT Corporation TOYOPUC product series’ (TOYOPUC-PC10 Series: PC10G-CPU TCC-6353: All versions, PC10GE TC

If Ethernet communication of the JTEKT Corporation TOYOPUC product series’ (TOYOPUC-PC10 Series: PC10G-CPU TCC-6353: All versions, PC10GE TCC-6464: All versions, PC10P TCC-6372: All versions, PC10P-DP TCC-6726: All versions, PC10P-DP-IO TCC-6752: All versions, PC10B-P TCC-6373: All versions, PC10B TCC-1021: All versions, PC10B-E/C TCU-6521: All versions, PC10E TCC-4737: All versions; TOYOPUC-Plus Series: Plus CPU TCC-6740: All versions, Plus EX TCU-6741: All versions, Plus EX2 TCU-6858: All versions, Plus EFR TCU-6743: All versions, Plus EFR2 TCU-6859: All versions, Plus 2P-EFR TCU-6929: All versions, Plus BUS-EX TCU-6900: All versions; TOYOPUC-PC3J/PC2J Series: FL/ET-T-V2H THU-6289: All versions, 2PORT-EFR THU-6404: All versions) are left in an open state by an attacker, Ethernet communications cannot be established with other devices, depending on the settings of the link parameters.

HighCVSS 7.5 · v3.1—No exploit No fix recorded

Published: Apr 19, 2021
Updated: Jun 16, 2026
EPSS: 1.1% · 65th percentile
CWE: CWE-404

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 1.1%

Noroxi analysis

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Affected systems

Vendor	Product	CPE
jtekt	pc10g-cpu tcc-6353 firmware	cpe:2.3:o:jtekt:pc10g-cpu_tcc-6353_firmware
jtekt	pc10g-cpu tcc-6353	cpe:2.3:h:jtekt:pc10g-cpu_tcc-6353
jtekt	pc10ge tcc-6464 firmware	cpe:2.3:o:jtekt:pc10ge_tcc-6464_firmware
jtekt	pc10ge tcc-6464	cpe:2.3:h:jtekt:pc10ge_tcc-6464
jtekt	pc10p tcc-6372 firmware	cpe:2.3:o:jtekt:pc10p_tcc-6372_firmware
jtekt	pc10p tcc-6372	cpe:2.3:h:jtekt:pc10p_tcc-6372
jtekt	pc10p-dp tcc-6726 firmware	cpe:2.3:o:jtekt:pc10p-dp_tcc-6726_firmware
jtekt	pc10p-dp tcc-6726	cpe:2.3:h:jtekt:pc10p-dp_tcc-6726
jtekt	pc10p-dp-io tcc-6752 firmware	cpe:2.3:o:jtekt:pc10p-dp-io_tcc-6752_firmware
jtekt	pc10p-dp-io tcc-6752	cpe:2.3:h:jtekt:pc10p-dp-io_tcc-6752
jtekt	pc10b-p tcc-6373 firmware	cpe:2.3:o:jtekt:pc10b-p_tcc-6373_firmware
jtekt	pc10b-p tcc-6373	cpe:2.3:h:jtekt:pc10b-p_tcc-6373

and 24 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

jtekt 2port-efr thu-6404 firmwareall versions
jtekt fl/et-t-v2h thu-6289 firmwareall versions
jtekt pc10b tcc-1021 firmwareall versions
jtekt pc10b-e/c tcu-6521 firmwareall versions
jtekt pc10b-p tcc-6373 firmwareall versions
jtekt pc10e tcc-4737 firmwareall versions
jtekt pc10g-cpu tcc-6353 firmwareall versions
jtekt pc10ge tcc-6464 firmwareall versions
jtekt pc10p tcc-6372 firmwareall versions
jtekt pc10p-dp tcc-6726 firmwareall versions
jtekt pc10p-dp-io tcc-6752 firmwareall versions
jtekt plus 2p-efr tcu-6929 firmwareall versions
jtekt plus bus-ex tcu-6900 firmwareall versions
jtekt plus cpu tcc-6740 firmwareall versions
jtekt plus efr tcu-6743 firmwareall versions
jtekt plus efr2 tcu-6859 firmwareall versions
jtekt plus ex tcu-6741 firmwareall versions
jtekt plus ex2 tcu-6858 firmwareall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (icscert). Independent of NVD's CPE analysis and usually ahead of it.

n/a JTEKT Corporation TOYOPUC products
- TOYOPUC-PC10 Series: PC10G-CPU TCC-6353: All versions, PC10GE TCC-6464: All versions, PC10P TCC-6372: All versions, PC10P-DP TCC-6726: All versions, PC10P-DP-IO TCC-6752: All versions, PC10B-P TCC-637, TOYOPUC-Plus Series: Plus CPU TCC-6740: All versions, Plus EX TCU-6741: All versions, Plus EX2 TCU-6858: All versions, Plus EFR TCU-6743: All versions, Plus EFR2 TCU-6859: All versions, Plus 2P-EFR TC, TOYOPUC-PC3J/PC2J Series: FL/ET-T-V2H THU-6289: All versions, 2PORT-EFR THU-6404: All versionsaffected

Same product

jtekt: all records

Other highest-scoring records for the same primary product.

CVE-2022-29958JTEKT TOYOPUC PLCs through 2022-04-29 do not ensure data integrity.
39Monitor
CVE-2022-29951JTEKT TOYOPUC PLCs through 2022-04-29 mishandle authentication.
36Monitor
CVE-2021-33011All versions of the afffected TOYOPUC-PC10 Series,TOYOPUC-Plus Series,TOYOPUC-PC3J/PC2J Series, TOYOPUC-Nano Series products may not be able
17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-404 · Improper Resource Shutdown or Release

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

us-cert.cisa.gov/ics/advisories/icsa-21-103-03

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

No Noroxi analysis for this record yet

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Data sources and verification

CNA: icscert

CVE.org (CNA)Aug 3, 2024, 8:48 PM UTC
NVDJun 16, 2026, 11:44 PM UTC
FIRST EPSSSep 30, 2026, 12:00 AM UTC

Each line is when that source was last processed for this record.

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