An issue was discovered in OPC UA .NET Standard Stack and Sample Code before GitHub…
Priority LOW 26CWE-320Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub.
Summary
An issue was discovered in OPC UA .NET Standard Stack and Sample Code before GitHub commit 2018-04-12, and OPC UA .NET Legacy Stack and Sample Code before GitHub commit 2018-03-13. A vulnerability in OPC UA applications can allow a remote attacker to determine a Server's private key by sending carefully constructed bad UserIdentityTokens as part of an oracle attack.
Why it matters now
EPSS 0.01149 67th percentileScored 2026-11-07
Fix Fixed OPCFoundation.NetStandard.Opc.Ua (NuGet): 1.3.352.12
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | OPCFoundation.NetStandard.Opc.Ua (NuGet) | before 1.3.352.12 | 1.3.352.12 | Patch available | GHSA-gr4c-5rq6-cgh3 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- OPCFoundation.NetStandard.Opc.Ua (NuGet) Vendor— Affected before 1.3.352.12 Fixed in 1.3.352.12 Patch available GHSA-gr4c-5rq6-cgh3
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:opcfoundation:ua-.net-legacy:*:*:*:*:*:*:*:* | up to 1.03.342 | Vulnerable | OPC Foundation |
| cpe:2.3:a:opcfoundation:ua-.netstandard:*:*:*:*:*:*:*:* | up to 1.03.352.10 | Vulnerable | OPC Foundation |
- cpe:2.3:a:opcfoundation:ua-.net-legacy:*:*:*:*:*:*:*:* Versions up to 1.03.342 Vulnerable ·OPC Foundation
- cpe:2.3:a:opcfoundation:ua-.netstandard:*:*:*:*:*:*:*:* Versions up to 1.03.352.10 Vulnerable ·OPC Foundation
Remediation
- Fix · GHSA-gr4c-5rq6-cgh3 OPCFoundation.NetStandard.Opc.Ua (NuGet) Fixed in 1.3.352.12 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2018-7559
- 2026-10-03 Alias added: GHSA-gr4c-5rq6-cgh3
References
Patch 2
Advisory 3
More OPC Foundation Ua-.net-legacy vulnerabilities
- TI-2017-08865 Unsigned versions of the DLLs distributed by the OPC Foundation may be replaced with malicious code. CVSS 3.0HIGH 8.8
- TI-2018-09034 An XXE vulnerability in the OPC UA Java and .NET Legacy Stack can allow remote attackers to trigger a denial of service. CVSS 3.0HIGH 8.2
- TI-2021-08921 Uncontrolled recursion in OPC Foundation OPC UA .NET Standard and OPC UA .NET Legacy CVSS 3.1HIGH 7.5
- TI-2018-08667 Failure to validate certificates in OPC Foundation UA Client Applications communicating… CVSS 3.0MEDIUM 5.3
Sources
- CVE-2018-7559 · CVE Program
- CVE-2018-7559 · NVD
- FIRST EPSS
- GHSA-gr4c-5rq6-cgh3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences