CVE-2021-27477
7.5 · HIGHOverview
CVE-2021-27477 is a high-severity vulnerability affecting jtekt pc10g-cpu_firmware. It was published on July 1, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, Plus 2P-EFR, PC10P-DP, PC10P-DP-IO, Plus BUS-EX, Nano 10GX, Nano 2ET,PC10PE, PC10PE-16/16P, PC10E, FL/ET-T-V2H, PC10B,PC10B-P, Nano CPU, PC10P, and PC10GE receive an invalid frame, the outside area of a receive buffer for FL-net are overwritten. As a result, the PLC CPU detects a system error, and the affected products stop.
Remediation
Check the references section for vendor advisories and patches from jtekt. Update pc10g-cpu_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| jtekt | pc10g-cpu_firmware | >= 0, < 3.91 | Affected |
| jtekt | 2port-efr_firmware | >= 0, < 1.50 | Affected |
| jtekt | plus_cpu_firmware | >= 0, < 3.11 | Affected |
| jtekt | plus_ex_firmware | >= 0, < 3.11 | Affected |
| jtekt | plus_ex2_firmware | >= 0, < 3.11 | Affected |
| jtekt | plus_efr_firmware | >= 0, < 3.11 | Affected |
| jtekt | plus_efr2_firmware | >= 0, < 3.11 | Affected |
| jtekt | plus_2p-efr_firmware | >= 0, < 3.11 | Affected |
| jtekt | pc10p-dp_firmware | >= 0, < 1.50 | Affected |
| jtekt | pc10p-dp-io_firmware | >= 0, < 1.50 | Affected |
Frequently Asked Questions
What is CVE-2021-27477?
CVE-2021-27477 is a high-severity vulnerability affecting jtekt pc10g-cpu_firmware. It was published on July 1, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2021-27477?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-27477?
Check the references section for vendor advisories and patches from jtekt. Update pc10g-cpu_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-27477?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-27477 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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