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CVE-2026-22924

Siemens Simatic Cn 4100 Firmware authentication bypass

9.1 CRITICALEPSS 0.30%
  1. Published12 May 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Siemens Simatic Cn 4100 Firmware< 5.0

Remediation

Fixed in
Siemens Simatic Cn 4100 Firmware≥ 5.0

References

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Frequently asked

Is CVE-2026-22924 being actively exploited?

CVE-2026-22924 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.30%.

How severe is CVE-2026-22924?

CVE-2026-22924 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.30% probability of exploitation.

Which products are affected by CVE-2026-22924?

Affected products include Siemens Simatic Cn 4100 Firmware.

How do I fix CVE-2026-22924?

Upgrade affected software to a fixed version, for example Siemens Simatic Cn 4100 Firmware 5.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-22924 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.