PT-2026-39983 · Siemens · Simatic Cn 4100

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-22925

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 CN 4100 versions prior to V5.0

Description SIMATIC CN 4100 is susceptible to resource exhaustion when subjected to a high volume of TCP SYN packets, a condition known as a TCP SYN flood. This allows an attacker to overwhelm system resources, rendering the service unavailable and causing denial-of-service conditions.

Recommendations Update to version V5.0. Isolate affected nodes.

Fix

DoS

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-22925

Affected Products

Simatic Cn 4100

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-22925 · Security Note
• https://t.me/CVEtracker/53475 · Telegram Post
• https://twitter.com/0x2ed3bb60/status/2054155232545030278 · Twitter Post
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html · Note