How severe is CVE-2019-18269?

CVE-2019-18269 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-18269 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18269?

CVE-2019-18269 primarily affects Omron Plc Cj Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-18269?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-18269 published?

CVE-2019-18269 was published on 2019-12-16 and last updated on 2026-06-17.

CVE-2019-18269

CVE-2019-18269 is a critical-severity vulnerability in Omron Plc Cj Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-412.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-412
Affected product: Omron Plc Cj Firmware
Published: 2019-12-16
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2019-18269?: Omron’s CS and CJ series PLCs have an unrestricted externally accessible lock vulnerability.
How severe is CVE-2019-18269?: CVE-2019-18269 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-18269 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18269?: CVE-2019-18269 primarily affects Omron Plc Cj Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-18269?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-18269 published?: CVE-2019-18269 was published on 2019-12-16 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:omron:plc_cj_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:omron:plc_cs_firmware:*:*:*:*:*:*:*:*

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