Vulnerability identifier: #VU53245

Vulnerability risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-27434

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Unified Automation .NET based OPC UA Client/Server SDK Bundle
Server applications / Other server solutions

Vendor: Unified Automation GmbH

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in the OPC UA .NET Framework. A remote attacker can gain unauthorized access to sensitive information on the system.

Note: This vulnerability affects the following OPC UA products:

Unified Automation .NET based OPC UA Client/Server SDK Bundle: Versions V3.0.7 and prior (.NET 4.5, 4.0, and 3.5 Framework versions only) 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Unified Automation .NET based OPC UA Client/Server SDK Bundle: 3.0.7

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External links
http://ics-cert.us-cert.gov/advisories/icsa-21-133-04

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.