CVE-2021-40873

Name: CVE-2021-40873
Creator: NVD / NIST
Published: 2021-11-10T23:15:08.35+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.27%

Last modified Jun 17, 2026

CVE-2021-40873 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Softing Industrial Automation OPC UA C++ SDK before 5.66, and uaToolkit Embedded before 1.40. Remote attackers to cause a denial of service (DoS) by sending crafted messages to a client or server. EPSS estimates a 1.27% chance of exploitation in the next 30 days.

Description

An issue was discovered in Softing Industrial Automation OPC UA C++ SDK before 5.66, and uaToolkit Embedded before 1.40. Remote attackers to cause a denial of service (DoS) by sending crafted messages to a client or server. The server process may crash unexpectedly because of a double free, and must be restarted.

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

1.27%

66.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-415

Affected Software

Vendor	Product	Versions
Softing	Datafeed Opc Suite	< 5.18
Softing	Edgeconnector	<= 2.31
Softing	Opc	< 5.66
Softing	Secure Integration Server	<= 1.22
Softing	Th Scope	>= 3.5
Softing	Uagates	< 1.73
Softing	Uatoolkit Embedded	< 1.40

References

https://industrial.softing.com/Vendor Advisory
https://industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin_CVE-2021-40873.pdfVendor Advisory
https://industrial.softing.com/Vendor Advisory
https://industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin_CVE-2021-40873.pdfVendor Advisory

Timeline

Published: Nov 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40873?

How severe is CVE-2021-40873?

CVE-2021-40873 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.27% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40873?

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-2021-40873?

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

Scan your code now

Source: NVD / NIST