# CVE-2026-22924: Siemens SIMATIC CN 4100 missing authentication and resource exhaustion

Source: https://junglewise.ai/threats/cve-2026-22924-siemens-simatic-cn-4100-missing-authentication-and-resource  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-12. Updated: 2026-06-29  
License: CC BY 4.0 with a link back

CVE-2026-22924 · Severity: critical · CVSS 9.1 · Published 2026-05-12

The SIMATIC CN 4100 is a communication node used to connect third-party systems within industrial process control environments. A vulnerability in this device allows unauthenticated users to create excessive connections, leading to a system crash or resource exhaustion. This can disrupt industrial operations, impact system availability, and potentially allow for unauthorized actions that compromise the integrity of the control network.

Technologies: [Siemens SIMATIC CN 4100](https://junglewise.ai/threats/technologies/simatic-cn-4100), [Siemens Simatic Cn 4100 Firmware](https://junglewise.ai/threats/technologies/simatic-cn-4100-firmware). Vendors: [Siemens](https://junglewise.ai/threats/vendors/siemens).

## Quick answers

**Is CVE-2026-22924 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-22924 being exploited in the wild.

**How severe is CVE-2026-22924?** Critical severity, with a CVSS score of 9.1, published 12 May 2026.

**Which products and versions are affected?** Siemens SIMATIC CN 4100 All versions < V5.0.

**Is there a fix for CVE-2026-22924?** A patch was published on 2026-05-12: Fixed in V5.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-22924 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-22924?** Check whether you run Siemens SIMATIC CN 4100 or Siemens Simatic Cn 4100 Firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The SIMATIC CN 4100 (versions prior to V5.0) suffers from a missing authentication vulnerability (CWE-306) for critical functions. The application fails to properly restrict unauthenticated connections, making it susceptible to resource exhaustion conditions. A remote, unauthenticated attacker can exploit this by initiating a high volume of connections or specific requests to exhaust system resources, leading to a denial of service (DoS) or the ability to perform unauthorized actions. This impacts both the availability and integrity of the device. Siemens has addressed this in version V5.0.

## Affected products

- Siemens SIMATIC CN 4100 All versions < V5.0

## Timeline

- 2026-05-12: disclosed
- 2026-05-12: advisory
- 2026-05-12: patched: Fixed in V5.0

## References

- [https://cert-portal.siemens.com/productcert/html/ssa-032379.html](https://cert-portal.siemens.com/productcert/html/ssa-032379.html)

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