#VU75794 Resource exhaustion in OPC UA .NET Standard - CVE-2023-27321

Vulnerability identifier: #VU75794

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-27321

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OPC UA .NET Standard
Server applications / Other server solutions

Vendor: OPC Foundation

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OPC UA .NET Standard: 1.4.355.26 - 1.4.371.60

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External links
https://claroty.com/team82/disclosure-dashboard/cve-2023-27321
https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf
https://www.zerodayinitiative.com/advisories/ZDI-23-709/

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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.