CVE-2020-8867

Name: CVE-2020-8867
Creator: NVD / NIST
Published: 2020-04-22T21:15:14.09+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.58%

Last modified Jun 17, 2026

CVE-2020-8867 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of OPC Foundation UA .NET Standard 1.04.358.30. Authentication is not required to exploit this vulnerability. EPSS estimates a 2.58% chance of exploitation in the next 30 days.

Description

This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of OPC Foundation UA .NET Standard 1.04.358.30. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of sessions. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to create a denial-of-service condition against the application. Was ZDI-CAN-10295.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.58%

83.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Opcfoundation	Unified Architecture .Net-Standard	<= 1.04.358.30

References

https://opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2020-8867.pdfVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-536/Third Party Advisory, VDB Entry
https://opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2020-8867.pdfVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-536/Third Party Advisory, VDB Entry

Timeline

Published: Apr 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8867?

How severe is CVE-2020-8867?

CVE-2020-8867 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.58% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8867?

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-2020-8867?

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

Scan your code now

Source: NVD / NIST