CVE-2020-6986

HIGH
7.5
CVSS Score
Published: March 5, 2020 at 08:05 PM UTC
Updated: June 17, 2026 at 03:24 AM UTC
5 products affected across 1 vendorPLC CJ2 FirmwarePLC CJ1 FirmwarePlc Cj2

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
omron-plc-cj1 (same device)
All versions
omron-plc-cj2 (same device)
All versions
All versions
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

x_refsource_MISCMitigationThird Party AdvisoryUS Government Resource
https://www.us-cert.gov/ics/advisories/icsa-20-063-03

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400

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