Vulnerability identifier: #VU51368

Vulnerability risk: Medium

CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-25674

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATICS S7-PLCSIM
Server applications / SCADA systems

Vendor: Siemens

Description

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

The vulnerability exists due to a NULL pointer dereference error. A remote authenticated attacker can use a specially crafted file and perform a denial of service (DoS) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

SIMATICS S7-PLCSIM: 5.4

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External links
http://ics-cert.us-cert.gov/advisories/icsa-21-068-01
http://cert-portal.siemens.com/productcert/pdf/ssa-256092.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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