CVE-2023-27321

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector : AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf	Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-23-548/	Third Party Advisory
https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf	Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-23-548/	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:opcfoundation:ua-.netstandard:*:*:*:*:*:*:*:*

History

14 Aug 2025, 01:37

Type	Values Removed	Values Added
References	~~() https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf -~~	() https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf - Vendor Advisory
References	~~() https://www.zerodayinitiative.com/advisories/ZDI-23-548/ -~~	() https://www.zerodayinitiative.com/advisories/ZDI-23-548/ - Third Party Advisory
First Time		Opcfoundation ua-.netstandard Opcfoundation
CWE		NVD-CWE-noinfo
CPE		cpe:2.3:a:opcfoundation:ua-.netstandard::::::::

Information

Published : 2024-05-07 23:15

Updated : 2025-08-14 01:37

NVD link : CVE-2023-27321

Mitre link : CVE-2023-27321

CVE.ORG link : CVE-2023-27321

JSON object : View

Products Affected

opcfoundation

ua-.netstandard

CWE

CWE-400

Uncontrolled Resource Consumption

NVD-CWE-noinfo

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