CVE-2023-41151Network attack vector

Unauthenticated server crash via blocked-socket error handling

Published Dec 14, 2023 · Updated May 22, 2025

Uncaught exception handling in Softing OPC UA C++ SDK 6.20.1 and earlier on Windows allows remote attackers to crash the server. An exception escapes when the server sends an error packet while its socket is blocked for writing, terminating the process. The same condition affects Secure Integration Server 1.22 and earlier and OPC Suite 5.30 and earlier, interrupting service until restart.

CVSS severity7.5
High
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception handling in Softing OPC UA C++ SDK 6.20.1 and earlier on Windows allows remote attackers to crash the server. An exception escapes when the server sends an error packet while its socket is blocked for writing, terminating the process. The same condition affects Secure Integration Server 1.22 and earlier and OPC Suite 5.30 and earlier, interrupting service until restart.

The record

CVE
CVE-2023-41151
Published
Dec 14, 2023
Updated
May 22, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, CWE-755, CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2023CVE publishedPublication date reported by the CVE source.
  2. May 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Softing Industrial Automation GmbHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-755Improper Handling of Exceptional Conditions
CWE-248Uncaught Exception
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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