Is CVE-2019-18261 actively exploited?

No active exploitation of CVE-2019-18261 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2019-18261 be exploited remotely?

Yes. CVE-2019-18261 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2019-18261?

CVE-2019-18261 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2019-18261

CRITICAL

CVE-2019-18261

CWE-307Published: December 16, 2019· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-18261 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.