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TI-2026-18410 Aliases CVE-2026-22925GHSA-45ff-x9p5-mq3g

Resource allocation without limits in Siemens SIMATIC CN 4100

Priority MEDIUM 44CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00324 25th percentileScored 2026-11-07
Fix Fixed SIMATIC CN 4100 (Siemens): V5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SiemensSIMATIC CN 4100before V5.0V5.0Patch availableCNA
  • SIMATIC CN 4100 VendorSiemens Affected before V5.0 Fixed in V5.0 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*before 5.0VulnerableSiemens
cpe:2.3:h:siemens:simatic_cn_4100:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
  • cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:* Versions before 5.0 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_cn_4100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens

Remediation

  • Fix · CNA SIMATIC CN 4100 (Siemens) Fixed in V5.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Siemens SIMATIC CN 4100 V5.0

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2026-18409 Missing authentication in Siemens SIMATIC CN 4100Priority MEDIUM 44
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-22925
  2. 2026-10-03 Alias added: GHSA-45ff-x9p5-mq3g

References

Advisory 1

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
  • TI-2024-21620 A vulnerability has been identified in SIMATIC CN 4100 (All versions < V3.0). CVSS 3.1CRITICAL 10.0
  • TI-2023-27102 A vulnerability has been identified in SIMATIC CN 4100 (All versions < V2.7). CVSS 3.1CRITICAL 9.8
  • TI-2024-21619 Hard-coded credentials in Siemens SIMATIC CN 4100 CVSS 3.1CRITICAL 9.8
  • TI-2026-18409 Missing authentication in Siemens SIMATIC CN 4100 CVSS 4.0HIGH 8.8
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences