HOMEVULNERABILITIESCVE-2021-27458
HIGH

CVE-2021-27458

CWE-404Published: April 19, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-27458 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

jtekt36 product(s)
pc10g-cpu tcc-6353 firmwarepc10g-cpu tcc-6353pc10ge tcc-6464 firmwarepc10ge tcc-6464pc10p tcc-6372 firmwarepc10p tcc-6372pc10p-dp tcc-6726 firmwarepc10p-dp tcc-6726pc10p-dp-io tcc-6752 firmwarepc10p-dp-io tcc-6752pc10b-p tcc-6373 firmwarepc10b-p tcc-6373+24
Source: NVD CPE · 36 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (2)

→
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-03Third Party Advisory · US Government Resource
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-03Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2021-27458
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-404
CISA KEVNo
Affected1 vendor(s)
PublishedApr 19, 2021

Related CVEs (CWE-404)

CVE-2025-5867
9.8
CVE-2023-24444
9.8
CVE-2026-1173
9.8
CVE-2018-8450
8.8
CVE-2026-11317
8.7
CVE-2020-26070
8.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-27458 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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