CVE-2026-22924 Missing authorization in SIMATIC CN 4100

What is CVE-2026-22924?

CVE-2026-22924 is a high-severity missing authorization vulnerability in Siemens SIMATIC CN 4100, published on 12 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-306

Which versions are affected by CVE-2026-22924?

It affects 1 product.

Products include Siemens Simatic Cn 4100 Firmware.

How do I fix CVE-2026-22924?

No fix has been published for CVE-2026-22924 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-22924 being exploited?

There is no known exploitation of CVE-2026-22924 in the wild and no public exploit code.

Other vulnerabilities in Siemens SIMATIC CN 4100

• CVE-2024-32741 Hardcoded credentials in SIMATIC CN 4100 Critical 10.0
• CVE-2023-29130 Privilege escalation in SIMATIC CN 4100 Critical 9.9
• CVE-2024-32740 Hardcoded credentials in SIMATIC CN 4100 Critical 9.8
• CVE-2023-49621 Hardcoded credentials in SIMATIC CN 4100 Critical 9.8
• CVE-2025-40938 Hardcoded credentials in SIMATIC CN 4100 Critical 9.2

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-9p8h-826j-wp3r.