How severe is CVE-2026-22924?

CVE-2026-22924 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-22924 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22924?

CVE-2026-22924 affects Siemens Simatic Cn 4100 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22924?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-22924 have an EU (EUVD) identifier?

Yes. CVE-2026-22924 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29423.

When was CVE-2026-22924 published?

CVE-2026-22924 was published on 2026-05-12 and last updated on 2026-06-29.

CVE-2026-22924

CVE-2026-22924 is a critical-severity vulnerability in Siemens Simatic Cn 4100 Firmware with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 8.8
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29423
Weakness: CWE-306
Affected product: Siemens Simatic Cn 4100 Firmware
Published: 2026-05-12
Last modified: 2026-06-29

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-22924?: CVE-2026-22924 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-22924 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22924?: CVE-2026-22924 affects Siemens Simatic Cn 4100 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22924?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-22924 have an EU (EUVD) identifier?: Yes. CVE-2026-22924 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29423.
When was CVE-2026-22924 published?: CVE-2026-22924 was published on 2026-05-12 and last updated on 2026-06-29.

References

https://cert-portal.siemens.com/productcert/html/ssa-032379.html

Affected products (1)

cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*

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