Vulnerability identifier: #VU17655

Vulnerability risk: Low

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-2018-16561

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC S7-300
Hardware solutions / Firmware

Vendor: Siemens

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

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send a specially crafted S7 communication packet to a communication interface of the CPU and cause a denial-of-service condition of the core functionality of the CPU.

Mitigation
Update to version 3.X.16.

Vulnerable software versions

SIMATIC S7-300: 2.0.0 - 3.3.0

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External links
http://cert-portal.siemens.com/productcert/pdf/ssa-306710.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.