CVE-2019-18261 — In Omron PLC CS series, all versions, Omron PLC CJ series, all versions, and Omr

In Omron PLC CS series, all versions, Omron PLC CJ series, all versions, and Omron PLC NJ series, all versions, the software does not implement sufficient measures to prevent multiple failed authentication attempts within in a short time frame, making it more susceptible to brute

01What is this vulnerability?

In Omron PLC CS series, all versions, Omron PLC CJ series, all versions, and Omron PLC NJ series, all versions, the software does not implement sufficient measures to prevent multiple failed authentication attempts within in a short time frame, making it more susceptible to brute force attacks.

02Affected products

Vendor	Product	Versions
n	a / Omron PLC CJ, CS and NJ Series	Omron PLC CS series, all versions, Omron PLC CJ series, all versions, Omron PLC NJ series, all versions

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-12-16T19:27:58.000Z
• Last modified: 2024-08-05T01:47:14.092Z

09References

• www.us-cert.gov — https://www.us-cert.gov/ics/advisories/icsa-19-346-03