# CVE-2023-27321: Uncontrolled Resource Consumption in OPC UA .NET Standard Reference Server

Source: https://junglewise.ai/threats/cve-2023-27321-uncontrolled-resource-consumption-in-opc-ua-net-standard  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-05-05  
License: CC BY 4.0 with a link back

CVE-2023-27321 · Severity: low · CVSS 3.1 · Published 2023-05-05

Uncontrolled Resource Consumption in OPC UA .NET Standard Reference Server

Technologies: [OPCFoundation.NetStandard.Opc.Ua.Server (NuGet)](https://junglewise.ai/threats/technologies/opcfoundation-netstandard-opc-ua-server). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2023-27321 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-27321 being exploited in the wild.

**How severe is CVE-2023-27321?** Low severity, with a CVSS score of 3.1, published 5 May 2023.

**Which products and versions are affected?** OPCFoundation.NetStandard.Opc.Ua.Server (NuGet) ECOSYSTEM:introduced=0,fixed=1.4.371.86.

**Is there a fix for CVE-2023-27321?** Yes. OPCFoundation.NetStandard.Opc.Ua.Server (NuGet): upgrade to 1.4.371.86 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2023-27321?** Check whether you run OPCFoundation.NetStandard.Opc.Ua.Server (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- OPCFoundation.NetStandard.Opc.Ua.Server (NuGet): upgrade to 1.4.371.86 or later

  ```sh
  dotnet add package OPCFoundation.NetStandard.Opc.Ua.Server --version 1.4.371.86
  ```


## Affected products

- OPCFoundation.NetStandard.Opc.Ua.Server (NuGet) ECOSYSTEM:introduced=0,fixed=1.4.371.86

## Identifiers

- CVE-2023-27321
- GHSA-vpf7-r2fv-75m9

## Related threats

- [Exposure of Sensitive Information in OPC UA .NET Standard Reference Server](https://junglewise.ai/threats/cve-2023-31048-exposure-of-sensitive-information-in-opc-ua-net-standard)
- [Exposure of Sensitive Information in OPCFoundation.NetStandard.Opc.Ua.Server](https://junglewise.ai/threats/cve-2022-33916-exposure-of-sensitive-information-in-opcfoundation-netstandard)