Vulnerability identifier: #VU51367

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-2021-25673

CWE-ID: CWE-835

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 infinite loop. A remote authenticated attacker can use a specially crafted file to consume all available system resources and cause denial of service conditions.

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

Vulnerable software versions

SIMATICS S7-PLCSIM: 5.4

---

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

---

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.