CVE-2020-6986

Name: CVE-2020-6986
Creator: NVD / NIST
Published: 2020-03-05T21:15:10.673+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.51%

Last modified Jun 17, 2026

CVE-2020-6986 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In all versions of Omron PLC CJ Series, an attacker can send a series of specific data packets within a short period, causing a service error on the PLC Ethernet module, which in turn causes a PLC service denied result.. EPSS estimates a 1.51% chance of exploitation in the next 30 days.

Description

In all versions of Omron PLC CJ Series, an attacker can send a series of specific data packets within a short period, causing a service error on the PLC Ethernet module, which in turn causes a PLC service denied result.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.51%

71.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Omron	Plc Cj1 Firmware	All versions
Omron	Plc Cj2 Firmware	All versions

References

https://www.us-cert.gov/ics/advisories/icsa-20-063-03Mitigation, Third Party Advisory, US Government Resource
https://www.us-cert.gov/ics/advisories/icsa-20-063-03Mitigation, Third Party Advisory, US Government Resource

Timeline

Published: Mar 5, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-6986?

How severe is CVE-2020-6986?

CVE-2020-6986 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.51% probability of exploitation in the next 30 days.

How do I fix CVE-2020-6986?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-6986?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST