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