{"id":"CVE-2021-27458","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-27458","generatedAt":"2026-10-28T02:57:45.500Z","title":"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…","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.","published":"2021-04-19T22:15:13.000Z","lastModified":"2026-06-17T03:44:54.000Z","status":"Modified","sourceIdentifier":"ics-cert@hq.dhs.gov","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-404"],"affected":["jtekt/pc10g-cpu tcc-6353 firmware","jtekt/pc10ge tcc-6464 firmware","jtekt/pc10p tcc-6372 firmware","jtekt/pc10p-dp tcc-6726 firmware","jtekt/pc10p-dp-io tcc-6752 firmware","jtekt/pc10b-p tcc-6373 firmware","jtekt/pc10b tcc-1021 firmware","jtekt/pc10b-e\\/c tcu-6521 firmware","jtekt/pc10e tcc-4737 firmware","jtekt/plus cpu tcc-6740 firmware","jtekt/plus ex tcu-6741 firmware","jtekt/plus ex2 tcu-6858 firmware","jtekt/plus efr tcu-6743 firmware","jtekt/plus efr2 tcu-6859 firmware","jtekt/plus 2p-efr tcu-6929 firmware","jtekt/plus bus-ex tcu-6900 firmware","jtekt/fl\\/et-t-v2h thu-6289 firmware","jtekt/2port-efr thu-6404 firmware"],"epss":{"score":0.01105,"percentile":0.65561,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.10%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-103-03","tags":["Third Party Advisory","US Government Resource"],"source":"ics-cert@hq.dhs.gov"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-103-03","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27458","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}