PT-2021-16746 · Siemens · Simatic S7-Plcsim

Published 2021-03-15 · Updated 2021-03-18 · CVE-2021-25675

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions SIMATIC S7-PLCSIM V5.4 (All versions)

Description A Denial-of-Service condition can be caused in the application by an attacker with local access to the system when it is used to open a specially crafted file. This can lead to a divide by zero operation, causing the application to terminate unexpectedly. The service can be restored by restarting the application.

Recommendations For SIMATIC S7-PLCSIM V5.4, avoid opening specially crafted files to prevent the Denial-of-Service condition until a fix is available. As a temporary workaround, consider implementing access controls to limit local access to the system.

Fix

Divide By Zero

Weakness Enumeration

CWE-369

Related Identifiers

CVE-2021-25675

Affected Products

Simatic S7-Plcsim

References · 4

• https://cert-portal.siemens.com/productcert/pdf/ssa-256092.pdf · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-25675 · Security Note
• https://osv.dev/vulnerability/CVE-2021-25675 · Vendor Advisory
• https://t.me/cibsecurity/24912 · Telegram Post