PT-2021-11121 · Siemens · Simatic Mv400

Published 2021-03-15 · Updated 2021-03-18 · CVE-2020-25241

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: SIMATIC MV400 family versions prior to V7.0.6

Description: A vulnerability has been identified in the SIMATIC MV400 family. The underlying TCP stack of the affected products does not correctly validate the sequence number for incoming TCP RST packages. An attacker could exploit this to terminate arbitrary TCP sessions.

Recommendations: For versions prior to V7.0.6, update to version V7.0.6 or later to resolve the issue. As a temporary workaround, consider restricting access to the TCP stack to minimize the risk of exploitation.

Fix

Improper Validation of Array Index

Weakness Enumeration

CWE-1285

CWE-129

Related Identifiers

CVE-2020-25241

Affected Products

Simatic Mv400

References · 4

• https://osv.dev/vulnerability/CVE-2020-25241 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-25241 · Security Note
• https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf · Vendor Advisory
• https://t.me/cibsecurity/24916 · Telegram Post