CVE-2019-18261
No exploitation reported by the sources we read.
- Published2019-12-16
- WeaknessCWE-307
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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.
Timeline
dates in UTC- 2019-12-1620:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-18261?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-18261?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| — | all versions | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| — | all versions | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| — | all versions | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Omron PLC CJ, CS and NJ Series
Omron PLC NJ series: all versions · Omron PLC CS series: all versions · Omron PLC CJ series: all versions
Fix
- Mitigation from the vendor CISA ICSA-19-346-03 · 3 productsFilter FTP port: Protect access to Omron's PLC with a firewall and block unnecessary remote access to FTP port (default: 21).
- Mitigation from the vendor CISA ICSA-19-346-03 · 3 productsFilter IP addresses: Protect access to Omron's PLC with a firewall and filtering devices connected to the PLC by IP address.
- Mitigation from the vendor CISA ICSA-19-346-03 · 3 productsEnsure the use of strong passwords.
- Mitigation from the vendor CISA ICSA-19-346-03 · 3 productsFor more information provided by Omron on these vulnerabilities refer to this Omron report.
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.19.8read 2026-10-23
- NVDCVSS 2.05read 2026-10-23
- CNAweakness (CWE)CWE-307read 2026-10-23
- NVDweakness (CWE)CWE-307read 2026-10-23
- FIRST EPSSEPSS score1.3 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2019-12-16
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2019-18261?
Is CVE-2019-18261 actively exploited?
What is the CVSS score for CVE-2019-18261?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.