What’s Vulnerable › Vulnerabilities

CVE-2021-40871

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-10 · updated 2026-06-17
• Weakness: CWE-843

Description

An issue was discovered in Softing Industrial Automation OPC UA C++ SDK before 5.66. Remote attackers to cause a denial of service (DoS) by sending crafted messages to a OPC/UA client. The client process may crash unexpectedly because of a wrong type cast, and must be restarted.

Affected products

• Softing Datafeed Opc Suite: before 5.18 — fixed in 5.18
• Softing Industrial Automation all versions prior to the latest build of version 4.47.0 OPC: before 5.66 — fixed in 5.66
• Softing Secure Integration Server: through 1.22
• Softing Th Scope: from 3.5

How to fix

Upgrade to a fixed version: Softing Datafeed Opc Suite 5.18; Softing Industrial Automation all versions prior to the latest build of version 4.47.0 OPC 5.66. Check the vendor advisory for mitigations.

References

• https://industrial.softing.com/
• https://industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin-CVE-2021-40871.pdf
• https://industrial.softing.com/
• https://industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin-CVE-2021-40871.pdf

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