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Vulnerability record · CVE-2026-22924 · published 12 May 2026

CVE-2026-22924: Siemens simatic cn 4100 firmware missing authentication for critical function vulnerability

Siemens · Simatic Cn 4100 Firmware

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0). The affected application does not properly restrict unauthenticated connections and is susceptible to resource exhaustion conditions. This could allow an attacker to disrupt normal operations or perform unauthorized actions, potentially impacting system availability and integrity.

8.8 CVSS 4.0 High EPSS 0.30% · top 79.7% CWE-306 · Missing authentication for critical function
8.8CVSS 4.0 base score
0.30%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
29 Jun 2026Last modified by NVD

Description

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0). The affected application does not properly restrict unauthenticated connections and is susceptible to resource exhaustion conditions. This could allow an attacker to disrupt normal operations or perform unauthorized actions, potentially impacting system availability and integrity.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert-portal.siemens.com/productcert/html/ssa-032379.html MitigationVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-22924), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.