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TI-2025-27073 Aliases CVE-2025-40593GHSA-vm7p-h5v8-4m2j

Improper input validation in Siemens SIMATIC CN 4100

Priority LOW 31CWE-20Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0). The affected application allows to control the device by storing arbitrary files in the SFTP folder of the device. This could allow an attacker to cause a denial of service condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00388 33rd percentileScored 2026-11-07
Fix Fixed SIMATIC CN 4100 (Siemens): V4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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 V4.0V4.0Patch availableCNA
  • SIMATIC CN 4100 VendorSiemens Affected before V4.0 Fixed in V4.0 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*before 4.0VulnerableSiemens
cpe:2.3:h:siemens:simatic_cn_4100:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
  • cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:* Versions before 4.0 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 V4.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-40593
  2. 2026-10-03 Alias added: GHSA-vm7p-h5v8-4m2j

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-2026-18410 Resource allocation without limits in Siemens SIMATIC CN 4100 CVSS 4.0HIGH 8.7
See all 19 →

Sources

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