#VU59232 Improper Certificate Validation in SINUMERIK Edge - CVE-2021-42027

Vulnerability identifier: #VU59232

Vulnerability risk: Medium

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-42027

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SINUMERIK Edge
Server applications / SCADA systems

Vendor: Siemens

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to improper certificate validation when initiating a TLS connection. A remote attacker can interfere in the communication path between the client and the intended server and spoof a trusted entity.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SINUMERIK Edge: before 3.2

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External links
https://cert-portal.siemens.com/productcert/pdf/ssa-523250.pdf

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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.