Denial of service in Omron PLC CJ Series

1) Resource exhaustion

EUVDB-ID: #VU25759

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

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

CPE2.3

• cpe:2.3:h:omron:omron_plc_cj_series:*:*:*:*:*:*:*:*

External links

https://ics-cert.us-cert.gov/advisories/icsa-20-063-03
https://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.