Vulnerability in Siemens .NET Client Library for SIMATIC S7 Webserver API

[ Description ]Official description

A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.61). Affected applications do not properly validate filenames received from remote servers during ticket downloads. This could allow an attacker who can manipulate the ticket response to write arbitrary files outside the intended download directory and, when overwriting is enabled, replace existing files accessible to the application.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• NCSC-NL13 Oct 2026NCSC-2026-0415

  Vulnerabilities fixed in Siemens products Translated from Dutch

  Probability/damage M/HCVE-2024-7322CVE-2025-6965CVE-2025-70873+38 more CVEs
• CERT-FR13 Oct 2026CERTFR-2026-AVI-1298

  Multiple vulnerabilities in Siemens products Translated from French

  Multiple vulnerabilities have been discovered in Siemens products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2021-41617CVE-2023-28531CVE-2023-51384+716 more CVEs
• BSI CERT-Bund12 Oct 2026WID-SEC-2026-3891

  Siemens SIMATIC S7: Multiple vulnerabilities Translated from German

  CVE-2026-46331CVE-2024-49998CVE-2025-21779+384 more CVEs

[ References ]References

• cert-portal.siemens.com/productcert/html/ssa-390352.html