Vulnerability identifier: #VU54460

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-27477

CWE-ID: CWE-119

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
TOYOPUC PLC Plus CPU
Hardware solutions / Firmware
TOYOPUC PLC Plus EX
Hardware solutions / Firmware
TOYOPUC PLC Plus EX2
Hardware solutions / Firmware
TOYOPUC PLC Plus EFR
Hardware solutions / Firmware
TOYOPUC PLC Plus EFR2
Hardware solutions / Firmware
TOYOPUC PLC Plus 2P-EFR
Hardware solutions / Firmware
TOYOPUC PLC Plus BUS-EX
Hardware solutions / Firmware
TOYOPUC PLC PC10E
Hardware solutions / Firmware
TOYOPUC PLC FL/ET-T-V2H
Hardware solutions / Firmware
TOYOPUC PLC PC10B
Hardware solutions / Firmware
TOYOPUC PLC PC10B-P
Hardware solutions / Firmware
TOYOPUC PLC Nano CPU
Hardware solutions / Firmware
TOYOPUC PLC PC10P
Hardware solutions / Firmware
TOYOPUC PLC PC10GE
Hardware solutions / Firmware
TOYOPUC PLC PC10G-CPU
Hardware solutions / Firmware
TOYOPUC PLC 2PORT-EFR
Hardware solutions / Firmware
TOYOPUC PLC PC10P-DP
Hardware solutions / Firmware
TOYOPUC PLC PC10P-DP-IO
Hardware solutions / Firmware
TOYOPUC PLC Nano 10GX
Hardware solutions / Firmware
TOYOPUC PLC Nano 2ET
Hardware solutions / Firmware
TOYOPUC PLC PC10PE
Hardware solutions / Firmware
TOYOPUC PLC PC10PE-16/16P
Hardware solutions / Firmware

Vendor: JTEKT Corporation

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error. A remote attacker on the local network can trigger memory corruption and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

TOYOPUC PLC Plus CPU: All versions

TOYOPUC PLC Plus EX: All versions

TOYOPUC PLC Plus EX2: All versions

TOYOPUC PLC Plus EFR: All versions

TOYOPUC PLC Plus EFR2: All versions

TOYOPUC PLC Plus 2P-EFR: All versions

TOYOPUC PLC Plus BUS-EX: All versions

TOYOPUC PLC PC10E: All versions

TOYOPUC PLC FL/ET-T-V2H: All versions

TOYOPUC PLC PC10B: All versions

TOYOPUC PLC PC10B-P: All versions

TOYOPUC PLC Nano CPU: All versions

TOYOPUC PLC PC10P: All versions

TOYOPUC PLC PC10GE: All versions

---

External links
http://ics-cert.us-cert.gov/advisories/icsa-21-180-04

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.