What’s Vulnerable › Vulnerabilities

CVE-2021-27458

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-19 · updated 2026-06-17
• Weakness: CWE-404

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.

Affected products

• Jtekt 2Port-Efr Thu-6404 Firmware: all versions
• Jtekt Fl/Et-T-V2H Thu-6289 Firmware: all versions
• Jtekt Pc10B-E/C Tcu-6521 Firmware: all versions
• Jtekt Pc10B-P Tcc-6373 Firmware: all versions
• Jtekt Pc10B Tcc-1021 Firmware: all versions
• Jtekt Pc10E Tcc-4737 Firmware: all versions
• Jtekt Pc10G-Cpu Tcc-6353 Firmware: all versions
• Jtekt Pc10Ge Tcc-6464 Firmware: all versions
• Jtekt Pc10P-Dp-Io Tcc-6752 Firmware: all versions
• Jtekt Pc10P-Dp Tcc-6726 Firmware: all versions
• Jtekt Pc10P Tcc-6372 Firmware: all versions
• Jtekt Plus 2P-Efr Tcu-6929 Firmware: all versions
• Jtekt Plus Bus-Ex Tcu-6900 Firmware: all versions
• Jtekt Plus Cpu Tcc-6740 Firmware: all versions
• Jtekt Plus Efr2 Tcu-6859 Firmware: all versions
• Jtekt Plus Efr Tcu-6743 Firmware: all versions
• Jtekt Plus Ex2 Tcu-6858 Firmware: all versions
• Jtekt Plus Ex Tcu-6741 Firmware: all versions

References

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

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