PT-2021-16745 · Siemens · Simatic S7-Plcsim

Published 2021-03-15 · Updated 2021-03-18 · CVE-2021-25674

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 NULL pointer deference condition, causing the application to terminate unexpectedly and requiring a restart to restore the service.

Recommendations For SIMATIC S7-PLCSIM V5.4, avoid opening specially crafted files until a fix is available. As a temporary workaround, consider implementing access controls to limit local access to the system and prevent potential attackers from exploiting this issue.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2021-25674

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-2021-25674 · Security Note
• https://osv.dev/vulnerability/CVE-2021-25674 · Vendor Advisory
• https://t.me/cibsecurity/24914 · Telegram Post