Description
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0). The affected application is susceptible to resource exhaustion when subjected to high volume of TCP SYN packets
This could allow an attacker to render the service unavailable and cause denial-of-service conditions by overwhelming system resources.
Published: 2026-05-12
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A vulnerability in the SIMATIC CN 4100 allows an attacker to trigger resource exhaustion by sending a high volume of TCP SYN packets. This leads to denial of service, effectively rendering the system unavailable. The weakness is a classic instance of resource exhaustion, cataloged as CWE-770.

Affected Systems

Siemens SIMATIC CN 4100 (all versions prior to V5.0) are affected by this issue. No specific patch version is provided in the advisory; a firmware upgrade to V5.0 or later would remove the vulnerability.

Risk and Exploitability

The CVSS score of 8.7 indicates a high severity risk. EPSS is not available, and the vulnerability is not listed in the CISA KEV catalog, suggesting no currently known active exploitation. The attack vector is likely network-based: an adversary could launch a TCP SYN flood from outside the local network to overwhelm the controller's resources. Given the lack of an official workaround, administrators should treat this as a priority threat if the device is exposed to external networks.

Generated by OpenCVE AI on May 12, 2026 at 10:24 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Update SIMATIC CN 4100 to version V5.0 or later to eliminate the vulnerability.
  • Configure network filtering or rate limiting to reduce the impact of high-volume SYN packets.
  • Deploy DoS protection mechanisms such as SYN cookies or a traffic shaper to mitigate resource exhaustion.

Generated by OpenCVE AI on May 12, 2026 at 10:24 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 12 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 12 May 2026 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Siemens
Siemens simatic Cn 4100
Vendors & Products Siemens
Siemens simatic Cn 4100

Tue, 12 May 2026 10:45:00 +0000

Type Values Removed Values Added
Title SIMATIC CN 4100 TCP SYN Flood Denial of Service

Tue, 12 May 2026 09:30:00 +0000

Type Values Removed Values Added
Description A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0). The affected application is susceptible to resource exhaustion when subjected to high volume of TCP SYN packets This could allow an attacker to render the service unavailable and cause denial-of-service conditions by overwhelming system resources.
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

Siemens Simatic Cn 4100
cve-icon MITRE

Status: PUBLISHED

Assigner: siemens

Published:

Updated: 2026-05-12T13:27:38.628Z

Reserved: 2026-01-13T15:21:45.769Z

Link: CVE-2026-22925

cve-icon Vulnrichment

Updated: 2026-05-12T13:27:16.616Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-12T10:16:44.057

Modified: 2026-05-12T14:19:41.400

Link: CVE-2026-22925

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-12T10:45:13Z

Weaknesses