CVE-2021-40871
HIGH
7.5
CVSS Score
Published: November 10, 2021 at 10:43 PM UTC
Updated: June 17, 2026 at 04:07 AM UTC
4 products affected across 1 vendorSecure Integration ServerOpcDatafeed Opc Suite
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Severity
HIGH7.5
Exploit prediction
EPSS 1%
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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 5.18
Affected range stops below 5.18, so it looks safe — our inference, not a vendor statement
v < 5.66
Affected range stops below 5.66, so it looks safe — our inference, not a vendor statement
v ≤ 1.22
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (2)
x_refsource_MISCVendor Advisory
Source: [email protected]
https://industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin-CVE-2021-40871.pdfCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-843
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