CVE-2025-7390Network attack vector

Authentication bypass via skipped client certificate trust check

Published Aug 21, 2025 · Updated Mar 27, 2026

Improper certificate validation in Softing OPC UA products allows remote attackers to bypass client authentication over HTTPS. The opc.https server fails to enforce its client certificate trust check, but Softing has not published the responsible function or exact validation error. Exploitation requires a secure-only endpoint and grants unauthorized access with confidentiality and integrity impact, without a reported service interruption.

CVSS severity9.1
Critical
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Softing OPC UA products allows remote attackers to bypass client authentication over HTTPS. The opc.https server fails to enforce its client certificate trust check, but Softing has not published the responsible function or exact validation error. Exploitation requires a secure-only endpoint and grants unauthorized access with confidentiality and integrity impact, without a reported service interruption.

The record

CVE
CVE-2025-7390
Published
Aug 21, 2025
Updated
Mar 27, 2026
Vendor
Softing Industrial Automation GmbH
Product
OPC UA C++ SDK
Classifications
CWE-295, CAPEC-115, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.40 <=6.80

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Softing Industrial Automation GmbH · OPC UA C++ SDKversion=6.40 <=6.80
Softing Industrial Automation GmbH · edgeAggregatorversion=0 <=2025.03
Softing Industrial Automation GmbH · edgeConnectorversion=0 <=2025.03

Published CVSS scores

9.1SoftingCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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-295Improper Certificate Validation
CAPEC-115Authentication Bypass
T1190Exploit Public-Facing Application

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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