Omron’s CS and CJ series PLCs have an unrestricted externally accessible lock vulnerability.

Description

Omron’s CS and CJ series PLCs have an unrestricted externally accessible lock vulnerability.

Scores

EPSS (exploitation in 30 days)

1.0% · top 36% of all CVEs (7 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.

Weakness

• CWE-412 Unrestricted Externally Accessible Lock (opens in a new tab)All about CWE-412 and its CVEs

Affected products

• Omron · Omron PLC CJ Series

  • affected all versions

• Omron · Omron PLC CS series

  • affected all versions

• Omron · Omron PLC NX1P2 series

  • affected all versions

What to do

Workaround: Omron recommends the following mitigation measures: * Filter FINS port: Protect access to Omron’s PLC with a firewall and blocking unnecessary remote access to FINS port (default: 9600). * Filter IP addresses: Protect access to Omron’s PLC with a firewall and filtering devices connected to the PLC by IP address. For more information provided by Omron on these vulnerabilities refer to Vulnerabilities in Omron CS and CJ series CPU PLCs https://gcc01.safelinks.protection.outlook.com/ .

References (2)

• https://www.us-cert.gov/ics/advisories/icsa-19-346-02 (opens in a new tab)x_refsource_MISCx_transferred
• https://www.omron-cxone.com/security/2019-12-06_PLC_EN.pdf (opens in a new tab)x_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2019-18269](https://trackcve.app/badge/CVE-2019-18269.svg)](https://trackcve.app/cve/CVE-2019-18269)

Record last updated 2 Jun 2026, 19:50 UTC.