Denial of service in MELSEC iQ-R Series CPU Modules

1) Resource exhaustion

EUVDB-ID: #VU48392

Risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5666

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

MELSEC iQ-R 00 CPU: 05 - 19

MELSEC iQ-R 01 CPU: 05 - 19

MELSEC iQ-R 02 CPU: 05 - 19

MELSEC iQ-R 04 (EN) CPU: 35 - 51

MELSEC iQ-R 08 (EN) CPU: 35 - 51

MELSEC iQ-R 16 (EN) CPU: 35 - 51

MELSEC iQ-R 32 (EN) CPU: 35 - 51

MELSEC iQ-R 120 (EN) CPU: 35 - 51

External links

http://jvn.jp/en/jp/JVN44764844/index.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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