Denial of service in OPC Foundation UA Products Built with .NET Framework

1) Uncontrolled Recursion

EUVDB-ID: #VU53244

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-2021-27432

CWE-ID: CWE-674 - Uncontrolled Recursion

Exploit availability: No

Description

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

The vulnerability exists due to an uncontrolled recursion. A remote attacker can cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OPC UA .NET Legacy: All versions

OPC UA .NET Standard: All versions

CPE2.3

• cpe:2.3:a:opc_foundation:opc_ua_.net_legacy:*:*:*:*:*:*:*:*
• cpe:2.3:a:opc_foundation:opc_ua_.net_standard:*:*:*:*:*:*:*:*

External links

https://ics-cert.us-cert.gov/advisories/icsa-21-133-03

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.