Vulnerability identifier: #VU49107

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-27267

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
KEPServerEX
Server applications / SCADA systems
ThingWorx Kepware Server
Server applications / SCADA systems
ThingWorx Industrial Connectivity
Server applications / SCADA systems
OPC-Aggregator
Server applications / SCADA systems

Vendor: Kepware

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error. A remote attacker can create and close OPC UA connections at a high rate that may cause a server to crash.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

KEPServerEX: 6.0 - 6.9

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External links
http://ics-cert.us-cert.gov/advisories/icsa-20-352-02

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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.