Denial of service in Omron PLC CJ Series

1) Resource exhaustion

EUVDB-ID: #VU25759

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-6986

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 improper resource management in excessive malformed packet processing. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack on the PLC service.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Omron PLC CJ series: All versions

External links

http://ics-cert.us-cert.gov/advisories/icsa-20-063-03
http://www.omron-cxone.com/security/2020-02-28_PLC_EN.pdf

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.