CVE-2023-27321

Name: CVE-2023-27321
Creator: NVD / NIST
Published: 2024-05-07T23:15:15.76+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.06%

Last modified Jun 17, 2026

CVE-2023-27321 is a vulnerability of currently unknown severity. 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. EPSS estimates a 1.06% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

1.06%

60.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Opcfoundation	Ua-.Netstandard	< 1.4.371.86

References

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

Timeline

Published: May 7, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-27321?

How severe is CVE-2023-27321?

Severity scoring for CVE-2023-27321 is pending analysis. The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.

How do I fix CVE-2023-27321?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-27321?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST