CVE-2020-8867
Insufficient Session Expiration and TOCTOU Race Condition in OPC FOundation UA .Net Standard
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.
How to fix CVE-2020-8867
To remediate CVE-2020-8867, upgrade the affected package to a fixed version below.
- —upgrade to 1.4.359.31 or later
Is CVE-2020-8867 being exploited?
Low — EPSS is 1.7%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.4.359.31
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |