CVE-2018-14821

Name: CVE-2018-14821
Creator: NVD / NIST
Published: 2018-09-20T19:29:00.47+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.50%

Last modified Jun 17, 2026

CVE-2018-14821 is a vulnerability of currently unknown severity. 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. EPSS estimates a 4.50% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

4.50%

90.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Rockwellautomation	Rslinx	<= 4.00.01

References

https://ics-cert.us-cert.gov/advisories/ICSA-18-263-02Third Party Advisory, US Government Resource
https://www.tenable.com/security/research/tra-2018-26Exploit, Third Party Advisory
https://ics-cert.us-cert.gov/advisories/ICSA-18-263-02Third Party Advisory, US Government Resource
https://www.tenable.com/security/research/tra-2018-26Exploit, Third Party Advisory

Timeline

Published: Sep 20, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-14821?

How severe is CVE-2018-14821?

Severity scoring for CVE-2018-14821 is pending analysis. The EPSS model estimates a 4.50% probability of exploitation in the next 30 days.

How do I fix CVE-2018-14821?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-14821?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST