What is CVE-2026-22924?

CVE-2026-22924 is a critical-severity vulnerability in Siemens Simatic Cn 4100, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-05-12.

How severe is CVE-2026-22924?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Siemens Simatic Cn 4100

CVE-2026-22924

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.

Vulnerability class: Broken Authentication

EPSS: 0.003 (22.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

productcert@siemens.com (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-22924?: CVE-2026-22924 is a critical-severity vulnerability in Siemens Simatic Cn 4100, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-05-12.
How severe is CVE-2026-22924?: Critical severity. CVSS v3 base score is 9.1 out of 10.