CVE-2021-40142

Name: CVE-2021-40142
Creator: NVD / NIST
Published: 2021-08-27T07:15:08.63+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.56%

Last modified Jun 17, 2026

CVE-2021-40142 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service (DoS) by sending carefully crafted messages that lead to Access of a Memory Location After the End of a Buffer.. EPSS estimates a 2.56% chance of exploitation in the next 30 days.

Description

In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service (DoS) by sending carefully crafted messages that lead to Access of a Memory Location After the End of a Buffer.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.56%

83.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Opcfoundation	Local Discover Server	< 1.04.402.463
Siemens	Simatic Process Historian Opc Ua Server Firmware	< 2022
Siemens	Simatic Process Historian Opc Ua Server Firmware	2022
Siemens	Simatic Net Pc	14
Siemens	Simatic Net Pc	15
Siemens	Simatic Net Pc	16
Siemens	Simatic Net Pc	17
Siemens	Simatic Wincc	All versions
Siemens	Simatic Wincc Runtime	All versions
Siemens	Simatic Wincc Unified Scada Runtime	All versions
Siemens	Telecontrol Server Basic	3.0

References

https://cert-portal.siemens.com/productcert/pdf/ssa-321292.pdfPatch, Third Party Advisory
https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2021-40142.pdfPatch, Vendor Advisory
https://opcfoundation.org/security-bulletins/Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-321292.pdfPatch, Third Party Advisory
https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2021-40142.pdfPatch, Vendor Advisory
https://opcfoundation.org/security-bulletins/Vendor Advisory

Timeline

Published: Aug 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40142?

How severe is CVE-2021-40142?

CVE-2021-40142 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.56% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40142?

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-2021-40142?

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

Scan your code now

Source: NVD / NIST