HIGH

CVE-2018-14821

CVSS v3

7.5

HIGH

EPSS Score

4.5 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

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

ICSA-18-263-02 CISA1 known affected
Rockwell Automation RSLinx Classic
RSLinx Classic: Versions 4.00.01 and prior

Full record on NVD

Description

Rockwell Automation RSLinx Classic Versions 4.00.01 and prior. This vulnerability may allow a remote, unauthenticated threat actor to intentionally send a malformed CIP packet to Port 44818, causing the RSLinx Classic application to terminate. The user will need to manually restart the software to regain functionality.

Technical details

Published: 2018-09-20

Frequently asked questions

What is CVE-2018-14821?

Is CVE-2018-14821 actively exploited?

Active exploitation of CVE-2018-14821 has not been confirmed. Its EPSS score was 4.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-14821?

CVE-2018-14821 has a CVSS v3 base score of 7.5 (HIGH severity).

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