The specific flaw exists within the handling of OPC UA ConditionRefresh requests. By sending a large number of requests, an attacker can consume all available resources on the server. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-20505.
Analysis and contextual insights are available on OpenCVE Cloud.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2023-1630 | OPC Foundation UA .NET Standard ConditionRefresh Resource Exhaustion Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of OPC Foundation UA .NET Standard. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of OPC UA ConditionRefresh requests. By sending a large number of requests, an attacker can consume all available resources on the server. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-20505. |
Github GHSA |
GHSA-vpf7-r2fv-75m9 | Uncontrolled Resource Consumption in OPC UA .NET Standard Reference Server |
Wed, 25 Feb 2026 19:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Opcfoundation unified Architecture .net-standard
|
|
| CPEs | cpe:2.3:a:opcfoundation:unified_architecture_.net-standard:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Opcfoundation unified Architecture .net-standard
|
|
| Metrics |
ssvc
|
Thu, 14 Aug 2025 06:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Opcfoundation
Opcfoundation ua-.netstandard |
|
| Weaknesses | NVD-CWE-noinfo | |
| CPEs | cpe:2.3:a:opcfoundation:ua-.netstandard:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Opcfoundation
Opcfoundation ua-.netstandard |
Status: PUBLISHED
Assigner: zdi
Published:
Updated: 2024-08-02T12:09:43.438Z
Reserved: 2023-02-28T17:58:45.477Z
Link: CVE-2023-27321
Updated: 2024-08-02T12:09:43.438Z
Status : Analyzed
Published: 2024-05-07T23:15:15.760
Modified: 2025-08-14T01:37:46.230
Link: CVE-2023-27321
No data.
OpenCVE Enrichment
No data.
EUVD
Github GHSA