CVE-2019-18858

Name: CVE-2019-18858
Creator: NVD / NIST
Published: 2019-11-20T18:15:10.917+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.96%

Last modified Jun 17, 2026

CVE-2019-18858 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow.. EPSS estimates a 1.96% chance of exploitation in the next 30 days.

Description

CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.96%

77.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Codesys	Control For Beaglebone	< 3.5.15.20
Codesys	Control For Empc-A\/Imx6	< 3.5.15.20
Codesys	Control For Iot2000	< 3.5.15.20
Codesys	Control For Linux	< 3.5.15.20
Codesys	Control For Pfc100	< 3.5.15.20
Codesys	Control For Pfc200	< 3.5.15.20
Codesys	Control For Plcnext	< 3.5.15.20
Codesys	Control For Raspberry Pi	< 3.5.15.20
Codesys	Control Rte	< 3.5.15.20
Codesys	Control Runtime System Toolkit	< 3.5.15.20
Codesys	Control Win	< 3.5.15.20
Codesys	Embedded Target Visu Toolkit	< 3.5.15.20
Codesys	Hmi	< 3.5.15.20
Codesys	Remote Target Visu Toolkit	< 3.5.15.20

References

https://customers.codesys.com/fileadmin/data/customers/security/2019/Advisory2019-10_CDS-68341.pdfVendor Advisory
https://www.tenable.com/security/research/tra-2019-48Exploit, Third Party Advisory
https://customers.codesys.com/fileadmin/data/customers/security/2019/Advisory2019-10_CDS-68341.pdfVendor Advisory
https://www.tenable.com/security/research/tra-2019-48Exploit, Third Party Advisory

Timeline

Published: Nov 20, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18858?

CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow.

How severe is CVE-2019-18858?

CVE-2019-18858 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.96% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18858?

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-2019-18858?

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

Scan your code now

Source: NVD / NIST