Denial of service in JTEKT TOYOPUC PLC products

1) Buffer overflow

EUVDB-ID: #VU54460

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 - Memory corruption

Exploit availability: No

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: before 3.11

TOYOPUC PLC Plus EX: before 3.11

TOYOPUC PLC Plus EX2: before 3.11

TOYOPUC PLC Plus EFR: before 3.11

TOYOPUC PLC Plus EFR2: before 3.11

TOYOPUC PLC Plus 2P-EFR: before 3.11

TOYOPUC PLC Plus BUS-EX: before 2.13

TOYOPUC PLC PC10E: before 1.12

TOYOPUC PLC FL/ET-T-V2H: before F2.8

TOYOPUC PLC PC10B: before 1.11

TOYOPUC PLC PC10B-P: before 1.11

TOYOPUC PLC Nano CPU: before 2.08

TOYOPUC PLC PC10P: before 1.05

TOYOPUC PLC PC10GE: before 1.04

TOYOPUC PLC PC10G-CPU: before 3.91

TOYOPUC PLC 2PORT-EFR: before 1.50

TOYOPUC PLC PC10P-DP: before 1.50

TOYOPUC PLC PC10P-DP-IO: before 1.50

TOYOPUC PLC Nano 10GX: before 3.00

TOYOPUC PLC Nano 2ET: before 2.40

TOYOPUC PLC PC10PE: before 1.02

TOYOPUC PLC PC10PE-16/16P: before 1.02

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.