Multiple vulnerabilities in Siemens SCALANCE X-300 Switches

1) Use of Hard-coded Cryptographic Key

Risk: High

CVSSv3: 7.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-28395

CWE-ID: CWE-321 - Use of Hard-coded Cryptographic Key

Exploit availability: No


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

The vulnerability exists due to affected devices do not create a new unique private key after factory reset. A remote attacker can create a man-in-the-middle situation and decrypt previously captured traffic.


Install updates from vendor's website.

Vulnerable software versions

SCALANCE X-300: before 4.1.0

External links

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

2) Heap-based buffer overflow

Risk: High

CVSSv3: < ..