CVE-2021-27477

HIGH

7.5

CVSS Score

Published: July 1, 2021 at 12:01 PM UTC

Updated: June 17, 2026 at 03:44 AM UTC

45 products affected across 1 vendorPlus Ex FirmwarePlus EX2 FirmwareNano CPU Firmware

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Severity

HIGH7.5

Exploit prediction

EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

2PORT Efr Firmware · Jtekt

95%

v < 1.50

Affected range stops below 1.50, so it looks safe — our inference, not a vendor statement

jtekt-2port-efr (same device)

Fl /et T V2H Firmware · Jtekt

95%

v < f2.8_e1.5

Affected range stops below f2.8_e1.5, so it looks safe — our inference, not a vendor statement

jtekt-fl-et-t-v2h (same device)

Nano 10GX Firmware · Jtekt

95%

v < 3.00

Affected range stops below 3.00, so it looks safe — our inference, not a vendor statement

jtekt-nano-10gx (same device)

Nano 2ET Firmware · Jtekt

95%

v < 2.40

Affected range stops below 2.40, so it looks safe — our inference, not a vendor statement

jtekt-nano-2et (same device)

Nano CPU Firmware · Jtekt

95%

v < 2.08

Affected range stops below 2.08, so it looks safe — our inference, not a vendor statement

jtekt-nano-cpu (same device)

PC10B Firmware · Jtekt

95%

v < 1.11

Affected range stops below 1.11, so it looks safe — our inference, not a vendor statement

jtekt-pc10b (same device)

PC10B P Firmware · Jtekt

95%

v < 1.11

Affected range stops below 1.11, so it looks safe — our inference, not a vendor statement

jtekt-pc10b-p (same device)

PC10E Firmware · Jtekt

95%

v < 1.02

Affected range stops below 1.02, so it looks safe — our inference, not a vendor statement

jtekt-pc10e (same device)

PC10G CPU Firmware · Jtekt

95%

v < 3.91

Affected range stops below 3.91, so it looks safe — our inference, not a vendor statement

jtekt-pc10g-cpu (same device)

PC10GE Firmware · Jtekt

95%

v < 1.04

Affected range stops below 1.04, so it looks safe — our inference, not a vendor statement

jtekt-pc10ge (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCThird Party AdvisoryUS Government Resource

Source: [email protected]

https://us-cert.cisa.gov/ics/advisories/icsa-21-180-04

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-119CWE-787

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